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Stock Options, Stock Grants and New Stock (Narrative) (Details) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended
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Sep. 30, 2013 | Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012 | Feb. 20, 2014 | Feb. 07, 2013 | Feb. 09, 2012 | Aug. 21, 2012 | Oct. 16, 2014 | Apr. 24, 2014 | Apr. 25, 2013 | Nov. 21, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options granted, weighted average fair value (dollars per share) |  | $ 6.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 7.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 6.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |  |  |  |  |  |  |  |
Stock options exercised (in shares) |  | 17,074us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 15,247us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 11,800us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  |  |  |  |
Options exercisable (shares) |  | 56,787us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber |  |  |  |  |  |  |  |  |  |
Options exercisable, weighted average exercise price (dollars per share) |  | $ 11.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  | $ 364,157us-gaap_ShareBasedCompensation | $ 331,362us-gaap_ShareBasedCompensation | $ 337,750us-gaap_ShareBasedCompensation |  |  |  |  |  |  |  |
Issuance of shares of common stock from the treasury (in shares) |  | 14,522us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued | 17,572us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued | 19,089us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued |  |  |  |  |  |  |  |
Issuance of common stock (shares) |  |  | 2,300,000us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | 34,233,000us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |  |  |  |  |  |  |  |
Planned Payments to Acquire Machinery and Equipment | 3,500,000synl_PlannedPaymentstoAcquireMachineryandEquipment |  |  |  |  |  |  |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock options exercised (in shares) |  | 17,074us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 15,247us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 11,800us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |
Option exercises, aggregate exercise price |  | 192,000synl_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodAggregateExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 163,000synl_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodAggregateExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 124,000synl_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodAggregateExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |
Cash received from exercise of stock options |  | 42,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 138,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 124,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares |  | 9,094us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1,752us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |  |
Stock repurchased during year |  | 150,000us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 25,000us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |  |
Options exercisable (shares) |  | 56,787us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 40,591us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 29,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |
Options exercisable, weighted average exercise price (dollars per share) |  | $ 11.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 11.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 10.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |
Share-based compensation expense |  | 261,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 249,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 228,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |
Total unrecognized compensation cost |  | 459,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |  |  |
Share-based compensation, weighted average period of recognition (years) |  | 2 years 3 months 25 days |  |  |  |  |  |  |  |  |  |
2011 Plan [Member] | Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options granted (shares) |  |  |  |  | 13,790us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember | 40,594us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember | 36,740us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember |  |  |  |  |
Options granted, weighted average exercise price (dollars per share) |  |  |  |  | $ 14.76us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember | $ 13.70us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember | $ 11.35us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember |  |  |  |  |
Options granted, weighted average fair value (dollars per share) |  |  |  |  | $ 6.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember | $ 6.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember | $ 5.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember |  |  |  |  |
Risk free interest rate (percent) |  |  |  |  | 2.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember | 2.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember | 2.04%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember |  |  |  |  |
Expected volatility rate (percent) |  |  |  |  | 52.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember | 53.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember | 53.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember |  |  |  |  |
Expected life (years) |  |  |  |  | 7 years | 7 years | 7 years |  |  |  |  |
Expected dividend yield (percent) |  |  |  |  | 1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember | 1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember | 2.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember |  |  |  |  |
Annual vesting rate (percent) |  |  |  |  | 20.00%synl_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember |  |  |  |  |  |  |
2005 Stock Awards Plan [Member] | Stock Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Annual vesting rate (percent) |  | 20.00%synl_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = synl_StockAwardsMember / us-gaap_PlanNameAxis = synl_A2005StockAwardsPlanMember |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  | 103,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = synl_StockAwardsMember / us-gaap_PlanNameAxis = synl_A2005StockAwardsPlanMember | 82,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = synl_StockAwardsMember / us-gaap_PlanNameAxis = synl_A2005StockAwardsPlanMember | 110,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = synl_StockAwardsMember / us-gaap_PlanNameAxis = synl_A2005StockAwardsPlanMember |  |  |  |  |  |  |  |
Total unrecognized compensation cost |  | 902,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = synl_StockAwardsMember / us-gaap_PlanNameAxis = synl_A2005StockAwardsPlanMember |  |  |  |  |  |  |  |  |  |
Share-based compensation, weighted average period of recognition (years) |  | 4 years 6 months 18 days |  |  |  |  |  |  |  |  |  |
Period after option grant before options can be exercised (years) |  | 1 year |  |  |  |  |  |  |  |  |  |
Share-based compensation expense, period of recognition (years) |  | 60 months |  |  |  |  |  |  |  |  |  |
Share-based compensation expense, net of taxes |  | 66,000synl_ShareBasedCompensationNetOfTaxes / us-gaap_AwardTypeAxis = synl_StockAwardsMember / us-gaap_PlanNameAxis = synl_A2005StockAwardsPlanMember | 52,000synl_ShareBasedCompensationNetOfTaxes / us-gaap_AwardTypeAxis = synl_StockAwardsMember / us-gaap_PlanNameAxis = synl_A2005StockAwardsPlanMember | 70,000synl_ShareBasedCompensationNetOfTaxes / us-gaap_AwardTypeAxis = synl_StockAwardsMember / us-gaap_PlanNameAxis = synl_A2005StockAwardsPlanMember |  |  |  |  |  |  |  |
Share-based compensation expense, net of taxes, (dollars per share) |  | $ 0.01synl_ShareBasedCompensationNetOfTaxesPerShare / us-gaap_AwardTypeAxis = synl_StockAwardsMember / us-gaap_PlanNameAxis = synl_A2005StockAwardsPlanMember | $ 0.01synl_ShareBasedCompensationNetOfTaxesPerShare / us-gaap_AwardTypeAxis = synl_StockAwardsMember / us-gaap_PlanNameAxis = synl_A2005StockAwardsPlanMember | $ 0.01synl_ShareBasedCompensationNetOfTaxesPerShare / us-gaap_AwardTypeAxis = synl_StockAwardsMember / us-gaap_PlanNameAxis = synl_A2005StockAwardsPlanMember |  |  |  |  |  |  |  |
President of Palmer [Member] | 2011 Plan [Member] | Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options granted (shares) |  |  |  |  |  |  |  | 75,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember / us-gaap_TitleOfIndividualAxis = synl_PresidentOfAcquireeMember |  |  |  |
Options granted, weighted average exercise price (dollars per share) |  |  |  |  |  |  |  | $ 12.73us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember / us-gaap_TitleOfIndividualAxis = synl_PresidentOfAcquireeMember |  |  |  |
Options granted, weighted average fair value (dollars per share) |  |  |  |  |  |  |  | $ 5.44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember / us-gaap_TitleOfIndividualAxis = synl_PresidentOfAcquireeMember |  |  |  |
Risk free interest rate (percent) |  |  |  |  |  |  |  | 1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember / us-gaap_TitleOfIndividualAxis = synl_PresidentOfAcquireeMember |  |  |  |
Expected volatility rate (percent) |  |  |  |  |  |  |  | 51.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember / us-gaap_TitleOfIndividualAxis = synl_PresidentOfAcquireeMember |  |  |  |
Expected life (years) |  |  |  |  |  |  |  | 7 years |  |  |  |
Expected dividend yield (percent) |  |  |  |  |  |  |  | 2.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = synl_A2011PlanMember / us-gaap_TitleOfIndividualAxis = synl_PresidentOfAcquireeMember |  |  |  |
Chief Executive Officer [Member] | 2005 Stock Awards Plan [Member] | Stock Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Granted (shares) |  |  |  |  |  |  |  |  | 31,080us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = synl_StockAwardsMember / us-gaap_PlanNameAxis = synl_A2005StockAwardsPlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |  |  |
Granted, weighted average grant date fair value (dollars per share) |  |  |  |  |  |  |  |  | $ 15.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = synl_StockAwardsMember / us-gaap_PlanNameAxis = synl_A2005StockAwardsPlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |  |  |
Non Employee Director [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of common stock from the treasury (in shares) |  |  |  |  |  |  |  |  |  | 7,088us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued / us-gaap_TitleOfIndividualAxis = synl_NonEmployeeDirectorMember | 9,411us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued / us-gaap_TitleOfIndividualAxis = synl_NonEmployeeDirectorMember |
Annual cash retainer fees |  |  |  |  |  |  |  |  |  | 111,000synl_AnnualCashRetainerFees / us-gaap_TitleOfIndividualAxis = synl_NonEmployeeDirectorMember | 128,000synl_AnnualCashRetainerFees / us-gaap_TitleOfIndividualAxis = synl_NonEmployeeDirectorMember |
Public Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (shares) | 2,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = synl_PublicOfferingMember |  |  |  |  |  |  |  |  |  |  |
Price of stock (usd per share) | $ 15.75us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = synl_PublicOfferingMember |  |  |  |  |  |  |  |  |  |  |
Repayments of lines of credit | $ 18,061,000us-gaap_RepaymentsOfLinesOfCredit / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = synl_PublicOfferingMember |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (shares) | 300,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_OverAllotmentOptionMember |  |  |  |  |  |  |  |  |  |  |
Price of stock (usd per share) | $ 15.75us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_OverAllotmentOptionMember |  |  |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | Non Employee Director [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum annual retainer percent |  | 100.00%synl_AnnualElectedRetainerFeesPercent / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = synl_NonEmployeeDirectorMember |  |  |  |  |  |  |  |  |  |
Specialty Pipe And Tube, Inc. [Member] | Certain Management Employees [Member] | 2005 Stock Awards Plan [Member] | Stock Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Granted (shares) |  |  |  |  |  |  |  |  |  |  |  | 23,665us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = synl_StockAwardsMember / us-gaap_BusinessAcquisitionAxis = synl_SpecialtyPipeAndTubeInc.Member / us-gaap_PlanNameAxis = synl_A2005StockAwardsPlanMember / us-gaap_TitleOfIndividualAxis = synl_CertainManagementEmployeesMember
Granted, weighted average grant date fair value (dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 15.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = synl_StockAwardsMember / us-gaap_BusinessAcquisitionAxis = synl_SpecialtyPipeAndTubeInc.Member / us-gaap_PlanNameAxis = synl_A2005StockAwardsPlanMember / us-gaap_TitleOfIndividualAxis = synl_CertainManagementEmployeesMember

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- Definition Share-based Compensation, Period of Recognition + References No definition available. + Details
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- Definition Share-based Compensation, Weighted Average Period of Recognition + References No definition available. + Details
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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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