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Note 3 - Reserve for Sales Returns and Allowance (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Reserve for Sales Returns and Allowances [Table Text Block] |
|  | 201 7 |  |  | 201 6 |  |  | 201 5 |
Balance at the beginning of yea r |  | $ | 1,967 |  |  | $ | 1,384 |  |  | $ | 1,308 |
Provision for returns and allowance s |  |  | 2,789 |  |  |  | 4,445 |  |  |  | 4,547 |
Actual returns and allowances paid to customer s |  |  | (3,631 | ) |  |  | (3,862 | ) |  |  | (4,471 | )
Balance at the end of yea r |  | $ | 1,125 |  |  | $ | 1,967 |  |  | $ | 1,384 |

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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: | nonnum: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