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Note 7 - Indebtedness (Details Textual)
12 Months Ended
Oct. 11, 2012
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 02, 2013
USD ($)
Long-term Debt   $ 856,000 $ 1,870,000  
Loans Payable [Member]        
Number of Machines Financed 2      
Debt Instrument, Interest Rate, Stated Percentage 1.83%      
Advances on Loan Payable   5,000,000    
Long-term Debt   856,000 $ 1,870,000  
Debt Instrument, Term     5 years  
Revolving Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 40,000,000
Letters of Credit Outstanding, Amount   400,000    
Long-term Line of Credit   $ 0    
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]        
Debt Instrument, Basis Spread on Variable Rate   1.00%    
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]        
Debt Instrument, Basis Spread on Variable Rate   1.50%    
Revolving Credit Facility [Member] | Prime Rate [Member] | Minimum [Member]        
Debt Instrument, Basis Spread on Variable Rate   0.00%    
Revolving Credit Facility [Member] | Prime Rate [Member] | Maximum [Member]        
Debt Instrument, Basis Spread on Variable Rate   0.25%