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Note 2 - Notes Payable and Long-term Debt (Details Textual)
3 Months Ended
Sep. 18, 2015
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
shares
Dec. 31, 2016
Aug. 25, 2016
USD ($)
Proceeds from Issuance of Long-term Debt   $ 2,870,000    
Promissory Note and Business Loan Agreement with BOKF [Member]          
Line of Credit Facility, Maximum Borrowing Capacity $ 6,000,000        
Promissory Note and Business Loan Agreement with BOKF [Member] | Maximum [Member]          
Debt Instrument, Covenants, Debt to EBITDA Ratio 1.5        
Promissory Note and Business Loan Agreement with BOKF [Member] | Minimum [Member]          
Debt Instrument, Covenants, Fixed Charge Coverage Ratio 1.2        
Promissory Note with BOKF [Member]          
Line of Credit Facility, Maximum Borrowing Capacity $ 10,000,000       $ 15,000,000
Line of Credit Facility, Term of the Term Note into which the Principal Balance Will Be Rolled 4 years        
Proceeds from Issuance of Long-term Debt   0 $ 2,900,000    
Treasury Stock, Shares, Acquired | shares     404,000    
Line of Credit Facility, Remaining Borrowing Capacity   $ 7,600,000      
Two Promissory Notes with BOKF [Member]          
Debt Instrument, Interest Rate, Effective Percentage   2.826%   2.557%  
Two Promissory Notes with BOKF [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate   1.85%