XML 32 R22.htm IDEA: XBRL DOCUMENT
v3.19.2

Note 4 - Net Sales (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2019
Notes Tables |
Schedule of Accounts Receivables and Contract Assets [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 2019 |  |  | 2018 |
Accounts receivable - trade |  | $ | 70,927 |  |  | $ | 64,017 |
Current contract assets |  |  | 43,674 |  |  |  | 49,236 |

X
- Definition Tabular disclosure of accounts receivables and contract assets. + References No definition available. + Details
Name: | sgc_ScheduleOfAccountsReceivablesAndContractAssetsTableTextBlock
Namespace Prefix: | sgc_
Data Type: | nonnum: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