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Note 3 - Reserve for Sales Returns and Allowances (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Reserve for Sales Returns and Allowances [Table Text Block] |
|  | Years Ended December 31, |
|  | 2023 |  |  | 2022 |
Balance at the beginning of year |  | $ | 2,090 |  |  | $ | 2,636 |
Provision for returns and allowances |  |  | 4,678 |  |  |  | 4,512 |
Actual returns and allowances paid to customers |  |  | (5,360 | ) |  |  | (5,058 | )
Balance at the end of year |  | $ | 1,408 |  |  | $ | 2,090 |

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- Definition Tabular disclosure of the reserve for sales returns and allowances + References No definition available. + Details
Name: | sgc_ReserveForSalesReturnsAndAllowancesTableTextBlock
Namespace Prefix: | sgc_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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