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Note 7 - Long-term Debt (Details Textual) - USD ($)
3 Months Ended
Mar. 09, 2012
Mar. 31, 2016
Mar. 31, 2015
Mar. 24, 2016
Sovereign Term Facility [Member] | Term Loan [Member]        
Debt Instrument, Face Amount $ 4,500,000      
Period Of Amortization 5 years      
Sovereign Term Facility [Member] | Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate 3.00%      
Sovereign Term Facility [Member] | Interest Rate Swap [Member]        
Derivative, Remaining Maturity 5 years      
Derivative Liability, Notional Amount $ 4,500,000      
Derivative, Swaption Interest Rate 4.11%      
Derivative, Average Swaption Interest Rate 4.11%      
Term Loan [Member] | Citizens Bank N.A. [Member]        
Debt Instrument, Face Amount       $ 10,000,000
Other Current Assets [Member]        
Debt Issuance Costs, Current, Net   $ 115,000    
Payments of Debt Issuance Costs   153,855  
Debt Issuance Costs, Reduction of Long-term Debt   39,000    
Long-term Debt and Capital Lease Obligations   489,467    
Long-term Debt and Capital Lease Obligations, Current   $ 141,919