Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Fixed interest rate related to the interest rate derivative.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Note 2 - Long-Term Debt (Details Textual) (USD $)	3 Months Ended	1 Months Ended			12 Months Ended
Note 2 - Long-Term Debt (Details Textual) (USD $)	Mar. 31, 2015	Jul. 31, 2018	Mar. 31, 2015	Jul. 31, 2013	Dec. 31, 2013	Jun. 30, 2013	Oct. 22, 2013	Sep. 30, 2013	May 01, 2014
Derivative, Fixed Interest Rate				2.53%us-gaap_DerivativeFixedInterestRate
Derivative, Notional Amount				$ 14,250,000invest_DerivativeNotionalAmount
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	2,000,000		2,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	3,000,000		3,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	3,000,000		3,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	16,000,000		16,000,000
Debt Issuance Cost	68,000us-gaap_DebtIssuanceCosts
Ratio Of Maximum Funded Indebtedness To EBITDA					4
Fixed Charges Numerator					1.25sgc_FixedChargesNumerator
Scenario, Forecast [Member]
Debt Instrument, Periodic Payment, Principal		3,250,000
Interest Rate Swap [Member]
Interest Rate Derivative Assets, at Fair Value	207,000		207,000
Increase (Decrease) in Derivative Assets			207,000
Other Tax Expense (Benefit)	74,000
Per Month through July 1, 2015 [Member]
Debt Instrument, Periodic Payment, Principal				187,500
Per Month through June 1, 2018 [Member]
Debt Instrument, Periodic Payment, Principal				250,000
Senior Debt [Member]
Ratio Of Maximum Funded Indebtedness To EBITDA					3.5
Term Loan [Member] \| Amended Credit Agreement [Member]
Debt Instrument, Face Amount						30,000,000
Debt Instrument, Interest Rate, Stated Percentage	1.13%		1.13%
Term Loan [Member] \| Amended Credit Agreement [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	0.95%
Revolving Credit Facility [Member] \| Amended Credit Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity						15,000,000
Line of Credit Facility, Commitment Fee Percentage					0.10%
Permitted Investments In Subsidiaries							5,000,000	1,000,000
Revolving Credit Facility [Member] \| Amended Credit Agreement [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	0.95%
Debt Instrument, Interest Rate, Stated Percentage	1.20%		1.20%
Add on Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity									$ 10,000,000
Line of Credit Facility, Commitment Fee Percentage	0.50%
Add on Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	0.95%
Debt Instrument, Interest Rate, Stated Percentage	1.20%		1.20%