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Note 6 - Contingencies (Details Textual) $ in Millions | Jun. 30, 2021 USD ($)
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BAMKO [Member] |
Business Combination, Contingent Consideration, Liability, Total | $ 2.3
BAMKO [Member] | Minimum [Member] |
Business Combination, Contingent Consideration, Liability, Total | 2.3
BAMKO [Member] | Maximum [Member] |
Business Combination, Contingent Consideration, Liability, Total | 2.8
Tangerine [Member] |
Business Combination, Contingent Consideration, Liability, Total | 1.1
Tangerine [Member] | Minimum [Member] |
Business Combination, Contingent Consideration, Liability, Total | 0.9
Tangerine [Member] | Maximum [Member] |
Business Combination, Contingent Consideration, Liability, Total | $ 1.4

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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=sgc_BAMKOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=sgc_TangerineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |