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Note 12 - Earnings Per Share (Details Textual) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | 271,507 | 448,298 | 322,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Weight Average Exercise Price (in dollars per share) | $ 19.77 | $ 19.73 | $ 22.02

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- Definition The weighted average exercise price of options excluded from the computation of earnings per share. + References No definition available. + Details
Name: | sgc_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightAverageExercisePrice
Namespace Prefix: | sgc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration