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Note 1 - Description of Business, Basis of Presentation and Summary of Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Property, Plant and Equipment, Useful Life [Table Text Block] |
Buildings (in years) |  | 20 to 40
Improvements (in years) |  | 5 to 40
Machinery, equipment and fixtures (in years) |  | 3 to 10

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- Definition Tabular disclosure of the useful life of property, plant and equipment. + References No definition available. + Details
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Namespace Prefix: | sgc_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration