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v3.22.2

Note 4 - Periodic Pension Expense (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) yr | Jun. 30, 2021 USD ($)
Defined Benefit Plans Number of Plans | 2 |  | 2 |
Defined Benefit Plans Retirement Age (Year) | yr |  |  | 65 |
Defined Benefit Plans Number Of Plans, Terminated | 2 |  | 2 |
Defined Benefit Plan, Termination Charge | $ | $ 0 | $ 6,945 | $ 0 | $ 6,945

X
- Definition Amount of termination charge of defined benefit plan. + References No definition available. + Details
Name: | sgc_DefinedBenefitPlanTerminationCharge
Namespace Prefix: | sgc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Defined benefit plans number of plans + References No definition available. + Details
Name: | sgc_DefinedBenefitPlansNumberOfPlans
Namespace Prefix: | sgc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Defined Benefit Plans Number Of Plans, Terminated + References No definition available. + Details
Name: | sgc_DefinedBenefitPlansNumberOfPlansTerminated
Namespace Prefix: | sgc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Defined benefit plans retirement age + References No definition available. + Details
Name: | sgc_DefinedBenefitPlansRetirementAge
Namespace Prefix: | sgc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration