Represents the fixed charge coverage ratio.

No definition available.

Name:	sgc_DebtInstrumentCovenantFixedChargeCoverageRatio
Namespace Prefix:	sgc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Information pertaining the debt covenant.

+ References

No definition available.

+ Details

Name:	sgc_DebtInstrumentCovenantMaximumPermittedCapitalExpenditures
Namespace Prefix:	sgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Ratio that the net leverage ratio cannot exceed to comply with the debt covenant.

+ References

No definition available.

+ Details

Name:	sgc_DebtInstrumentCovenantNetLeverageRatio
Namespace Prefix:	sgc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Information pertaining to the covenant.

+ References

No definition available.

+ Details

Name:	sgc_DebtInstrumentCovenantPermittedInvestments
Namespace Prefix:	sgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Information to the amount of payments permitted under the covenant.

+ References

No definition available.

+ Details

Name:	sgc_DebtInstrumentCovenantPermittedPaymentsAmount
Namespace Prefix:	sgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The maximum amount of additional borrowing capacity under a line of credit that is available as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	sgc_LineOfCreditFacilityAdditionalCapacityAvailable
Namespace Prefix:	sgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1E
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 470
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481544/470-10-50-1

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in remainder of current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=sgc_CreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=sgc_PNCBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=sgc_AdjustedSecuredOvernightFinancingRateSOFROvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=sgc_TermLoanMember
Namespace Prefix:
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Note 3 - Long-term Debt (Details Textual) - Credit Agreement [Member] $ in Thousands			12 Months Ended
	May 04, 2023 USD ($)	Aug. 23, 2022 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023	Jun. 30, 2023 USD ($)	Mar. 31, 2023
Debt Instrument Covenant, Net Leverage Ratio		4.0			3.7
Debt Instrument Covenant Fixed Charge Coverage Ratio		1.25			2.0
PNC Bank [Member]
Line of Credit Facility, Additional Capacity Available		$ 75,000
Debt Instrument Covenant, Maximum Permitted Capital Expenditures	$ 10,000
Debt Instrument Covenant, Permitted Payments, Amount	$ 20,000
Debt, Weighted Average Interest Rate					7.20%
PNC Bank [Member] \| Forecast [Member]
Debt Instrument Covenant, Permitted Payments, Amount			$ 10,000
Debt Instrument Covenant, Permitted Investments			$ 5,000
PNC Bank [Member] \| Maximum [Member]
Debt Instrument Covenant, Net Leverage Ratio	4.0				4.8	4.5
PNC Bank [Member] \| Maximum [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		0.25%
PNC Bank [Member] \| Maximum [Member] \| Adjusted Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		2.00%
PNC Bank [Member] \| Maximum [Member] \| Forecast [Member]
Debt Instrument Covenant, Net Leverage Ratio			4.0	4.5
PNC Bank [Member] \| Maximum [Member] \| Forecast [Member] \| Secured Overnight Financing Rate (SOFR) [Member]
Debt Instrument, Basis Spread on Variable Rate			2.50%
PNC Bank [Member] \| Minimum [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		0.10%
PNC Bank [Member] \| Minimum [Member] \| Adjusted Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		1.00%
Revolving Credit Facility [Member]
Letters of Credit Outstanding, Amount					$ 0
Revolving Credit Facility [Member] \| PNC Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 125,000
Revolving Credit Facility [Member] \| PNC Bank [Member] \| Maximum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.25%
Revolving Credit Facility [Member] \| PNC Bank [Member] \| Maximum [Member] \| Forecast [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.30%
Revolving Credit Facility [Member] \| PNC Bank [Member] \| Minimum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.125%
Term Loan [Member] \| PNC Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 75,000
Long-Term Debt, Maturity, Remainder of Fiscal Year					1,900
Long-Term Debt, Maturity, Year One					4,700
Long-Term Debt, Maturity, Year Two					5,600
Long-Term Debt, Maturity, Year Three					6,600
Long-Term Debt, Maturity, Year Four					$ 52,500