XML 79 R64.htm IDEA: XBRL DOCUMENT
v3.20.4

Benefit Plans and Collective Bargaining Agreements - United Steelworkers Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Defined Contribution Plan Disclosure [Line Items] |  |
Total employer contributions to plans under collective-bargaining arrangements | $ 29,851 | $ 28,469
401(k) and Profit Sharing Plan |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Employee maximum contribution percentage | 60.00% |
Employee maximum contribution amount | $ 19,500 |
Minimum age to qualify under Economic Growth and Tax Relief Reconciliation Act | 50 years |
Employee additional contribution eligible under economic growth and tax relief reconciliation act | $ 6,500 |
Employee maximum contribution eligible under economic growth and tax relief reconciliation act | $ 26,000 |
Employer contribution as a percentage of participant's eligible compensation | 3.00% |
Matching percentage by employer of employees' gross pay | 4.00% |
Employer contributions to defined benefit plans | $ 200,000 | 200,000
Employer discretionary contribution | 0 | 0
Maximum | Other Pension, Postretirement and Supplemental Plans |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Employer contributions to defined benefit plans | $ 200,000 | $ 200,000
Funding percentage under defined benefit plans |  | 84.00%
Employer contribution percentage of each participant's eligible compensation | 4.25% |
Employer's contribution percentage of total contributions | 5.00% |

X
- Definition Defined Benefit Plan, Employer Contribution Percent of Eligible Compensation + References No definition available. + Details
Name: | synl_DefinedBenefitPlanEmployerContributionPercentofEligibleCompensation
Namespace Prefix: | synl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan, Employer Contribution as Percent of Total Contributions + References No definition available. + Details
Name: | synl_DefinedBenefitPlanEmployerContributionasPercentofTotalContributions
Namespace Prefix: | synl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan, Additional Annual Contribution Per Employee, Amount Under Economic Growth and Tax Relief Reconciliation Act + References No definition available. + Details
Name: | synl_DefinedContributionPlanAdditionalAnnualContributionPerEmployeeAmountUnderEconomicGrowthAndTaxReliefReconciliationAct
Namespace Prefix: | synl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Defined Contribution Plan, Additional Annual Contribution Per Employee, Minimum Age Under Economic Growth and Tax Relief Reconciliation Act + References No definition available. + Details
Name: | synl_DefinedContributionPlanAdditionalAnnualContributionPerEmployeeMinimumAgeUnderEconomicGrowthAndTaxReliefReconciliationAct
Namespace Prefix: | synl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan, Employer Contribution, Percent of Employees' Gross Pay + References No definition available. + Details
Name: | synl_DefinedContributionPlanEmployerContributionPercentofEmployeesGrossPay
Namespace Prefix: | synl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount Under Economic Growth and Tax Relief Reconciliation Act + References No definition available. + Details
Name: | synl_DefinedContributionPlanMaximumAnnualContributionPerEmployeeAmountUnderEconomicGrowthAndTaxReliefReconciliationAct
Namespace Prefix: | synl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Multiemployer Plans, Collective-Bargaining Arrangement, Amount of Employer's Contributions + References No definition available. + Details
Name: | synl_MultiemployerPlansCollectiveBargainingArrangementAmountOfEmployersContributions
Namespace Prefix: | synl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of plan assets to benefit obligation of defined benefit plan. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanFundedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=synl_A401kandProfitSharingPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |