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Industry Segments (Narrative) (Details) (USD $) | 12 Months Ended
--- | ---
Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Segment Reporting Information [Line Items] |  |  |
Number of operating segments (segments) | 2us-gaap_NumberOfOperatingSegments |  |
Goodwill | $ 23,250,201us-gaap_Goodwill | $ 17,252,678us-gaap_Goodwill |
Metals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 21,895,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = synl_MetalsSegmentMember | 15,898,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = synl_MetalsSegmentMember |
Concentration risk (percentage) | 82.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_StatementBusinessSegmentsAxis = synl_MetalsSegmentMember |  |
Number of suppliers (entities) | 7synl_NumberOfSuppliers / us-gaap_StatementBusinessSegmentsAxis = synl_MetalsSegmentMember |  |
Number of suppliers providing majority of supplies (entities) | 1synl_NumberOfSuppliersProvidingMajorityOfSupplies / us-gaap_StatementBusinessSegmentsAxis = synl_MetalsSegmentMember |  |
Specialty Chemicals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 1,355,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = synl_SpecialtyChemicalsSegmentMember | 1,355,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = synl_SpecialtyChemicalsSegmentMember |
Concentration risk (percentage) | 49.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_StatementBusinessSegmentsAxis = synl_SpecialtyChemicalsSegmentMember |  |
Number of suppliers providing majority of supplies (entities) | 8synl_NumberOfSuppliersProvidingMajorityOfSupplies / us-gaap_StatementBusinessSegmentsAxis = synl_SpecialtyChemicalsSegmentMember |  |
Corporate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Environmental charges | $ 13,000us-gaap_EnvironmentalRemediationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | $ 17,000us-gaap_EnvironmentalRemediationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | $ 46,000us-gaap_EnvironmentalRemediationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Supplier One [Member] | Metals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk (percentage) | 42.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = synl_SupplierConcentrationRiskOneMember / us-gaap_StatementBusinessSegmentsAxis = synl_MetalsSegmentMember |  |
Revenue [Member] | Metals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of major customers (entities) | 0synl_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_StatementBusinessSegmentsAxis = synl_MetalsSegmentMember |  | 0synl_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_StatementBusinessSegmentsAxis = synl_MetalsSegmentMember
Concentration risk (percentage) |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_StatementBusinessSegmentsAxis = synl_MetalsSegmentMember |
Revenue [Member] | Specialty Chemicals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk (percentage) | 31.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_StatementBusinessSegmentsAxis = synl_SpecialtyChemicalsSegmentMember | 40.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_StatementBusinessSegmentsAxis = synl_SpecialtyChemicalsSegmentMember | 28.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_StatementBusinessSegmentsAxis = synl_SpecialtyChemicalsSegmentMember
United States [Member] | Metals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of major customers (entities) |  | 1synl_NumberOfMajorCustomers / us-gaap_StatementBusinessSegmentsAxis = synl_MetalsSegmentMember / us-gaap_StatementGeographicalAxis = country_US |
United States [Member] | Specialty Chemicals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of major customers (entities) | 1synl_NumberOfMajorCustomers / us-gaap_StatementBusinessSegmentsAxis = synl_SpecialtyChemicalsSegmentMember / us-gaap_StatementGeographicalAxis = country_US |  |
BRISMET, Palmer and Specialty [Member] | Metals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Ownership percentage of subsidiary (percent) | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = synl_MetalsSegmentSubsidiariesMember / us-gaap_StatementBusinessSegmentsAxis = synl_MetalsSegmentMember |  |
Manufacturers Soap and Chemical Company [Member] | Specialty Chemicals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Ownership percentage of subsidiary (percent) | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = synl_SpecialtyChemicalsSegmentSubsidiariesMember / us-gaap_StatementBusinessSegmentsAxis = synl_SpecialtyChemicalsSegmentMember |  |
Maximum [Member] | Revenue [Member] | Metals Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk (percentage) |  |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementBusinessSegmentsAxis = synl_MetalsSegmentMember

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