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Note 5 - Property, Plant and Equipment (Details) - Property, Plant and Equipment (USD $)
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 58,500,000us-gaap_PropertyPlantAndEquipmentGross $ 54,351,000us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization (42,215,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (41,191,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
16,285,000us-gaap_PropertyPlantAndEquipmentNet 13,160,000us-gaap_PropertyPlantAndEquipmentNet
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 4,485,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		 2,340,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Buildings, Improvements and Leaseholds [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 11,329,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= sgc_BuildingsImprovementsAndLeaseholdsMember		 11,719,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= sgc_BuildingsImprovementsAndLeaseholdsMember
Machinery, Equipment and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 42,686,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= sgc_MachineryEquipmentAndFixturesMember		 $ 40,292,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= sgc_MachineryEquipmentAndFixturesMember