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Note 4 - Supplemental Cash Flow Information (Details Textual) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Taxes Paid $ 18,000us-gaap_IncomeTaxesPaid $ 3,000us-gaap_IncomeTaxesPaid
Interest Paid $ 95,000us-gaap_InterestPaid $ 63,000us-gaap_InterestPaid
Company Stock Received in Lieu of Cash Stock Options Exercised 3,432sgc_CompanyStockReceivedInLieuOfCashStockOptionsExercised  
Common Stock [Member]    
Stock Issued During Period, Shares, New Issues 9,640us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember