XML 40 R28.htm IDEA: XBRL DOCUMENT
v3.22.1

Note 3 - Reserve for Sales Returns and Allowances (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Notes Tables |
Reserve for Sales Returns and Allowances [Table Text Block] |
|  | Years Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Balance at the beginning of year |  | $ | 3,365 |  |  | $ | 2,112 |  |  | $ | 1,893 |
Provision for returns and allowances |  |  | 4,911 |  |  |  | 7,699 |  |  |  | 4,334 |
Actual returns and allowances paid to customers |  |  | (5,640 | ) |  |  | (6,446 | ) |  |  | (4,115 | )
Balance at the end of year |  | $ | 2,636 |  |  | $ | 3,365 |  |  | $ | 2,112 |

X
- 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

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