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Note 4 - Net Income Per Share (Details Textual) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	654,495	309,778	549,430	335,071
Antidilutive Securities Excluded from Computation of Earnings Per Share, Weight Average Exercise Price (in dollars per share)	$ 16.52	$ 21.44	$ 18.11	$ 21.4

X

- Definition

The weighted average exercise price of options excluded from the computation of earnings per share.

+ References

No definition available.

+ Details

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Namespace Prefix:	sgc_
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Balance Type:	na
Period Type:	duration

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration