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Note 2 - Long-Term Debt (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Term loan payable to Fifth Third Bank, maturing July 1, 2018 $ 28,000,000us-gaap_LongTermDebt $ 25,035,000us-gaap_LongTermDebt
Current portion of long-term debt 2,750,000us-gaap_LongTermDebtCurrent 2,375,000us-gaap_LongTermDebtCurrent
LONG TERM DEBT 25,250,000us-gaap_LongTermDebtNoncurrent 22,660,000us-gaap_LongTermDebtNoncurrent
Note Payable Maturing July 1, 2016 [Member]    
Term loan payable to Fifth Third Bank, maturing July 1, 2018 4,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sgc_NotePayableMaturingJuly12016Member
440,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sgc_NotePayableMaturingJuly12016Member
Note Payable Maturing July 1, 2018 [Member]    
Term loan payable to Fifth Third Bank, maturing July 1, 2018   220,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sgc_NotePayableMaturingJuly12018Member
Term Loan [Member]    
Term loan payable to Fifth Third Bank, maturing July 1, 2018 $ 24,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sgc_TermLoanMember
$ 24,375,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= sgc_TermLoanMember