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Note 2 - Notes Payable and Long-term Debt (Details Textual)
6 Months Ended
Sep. 18, 2015
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
shares
Dec. 31, 2016
Aug. 25, 2016
USD ($)
Aug. 24, 2016
USD ($)
Jun. 07, 2016
shares
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares             2,200,000
Proceeds from Issuance of Long-term Debt   $ 3,660,505        
Promissory Note with BOKF [Member]              
Treasury Stock, Shares, Acquired | shares     520,500        
Line of Credit Facility, Remaining Borrowing Capacity   $ 7,600,000          
Line of Credit Facility, Maximum Borrowing Capacity $ 10,000,000       $ 15,000,000 $ 10,000,000  
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 $ 3,700,000        
Promissory Note and Business Loan Agreement with BOKF [Member]              
Line of Credit Facility, Maximum Borrowing Capacity $ 6,000,000            
Proceeds from Issuance of Long-term Debt   $ 0 $ 0        
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            
Two Promissory Notes with BOKF [Member]              
Debt Instrument, Interest Rate, Effective Percentage   2.86%   2.557%      
Two Promissory Notes with BOKF [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Basis Spread on Variable Rate   1.85%