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Note 6 - Long-term Debt (Details Textual) - USD ($)
Mar. 09, 2012
Dec. 31, 2015
Dec. 31, 2014
Sovereign Term Facility [Member] | Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 3.00%    
Sovereign Term Facility [Member] | Term Loan [Member]      
Debt Instrument, Face Amount $ 4,500,000    
Period Of Amortization 5 years    
Sovereign Term Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap [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%    
Restated Agreement [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility, Interest Rate at Period End   3.25%  
Assets Held under Capital Leases [Member]      
Property, Plant and Equipment, Gross   $ 1,363,977 $ 1,118,720
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment   $ 971,000 765,000
Line of Credit Facility, Interest Rate at Period End   3.50%  
Long-term Debt and Capital Lease Obligations   $ 295,452 161,555
Long-term Debt and Capital Lease Obligations, Current   111,491 71,713
Property, Plant and Equipment, Gross   7,423,467 6,965,854
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment   $ 5,064,731 $ 4,210,668