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Note 12 - Subsequent Event (Details Textual)	May 01, 2022
Subsequent Event [Member] | Guardian Products, Inc [Member] | Restricted Shares [Member]
Business Acquisition, Equity Interested Issued, Vesting Period (Year)	3 years

X

- Definition

Period in which the equity interest holder's right to exercise the equity.

+ References

No definition available.

+ Details

Name:	sgc_BusinessAcquisitionEquityInterestedIssuedVestingPeriod
Namespace Prefix:	sgc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=sgc_GuardianProductsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_EquityInterestIssuedOrIssuableByTypeAxis=sgc_RestrictedSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: