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Note 5 - Notes Payable and Long-term Debt (Details Textual)
12 Months Ended
Sep. 18, 2015
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
Aug. 25, 2016
USD ($)
Aug. 24, 2016
USD ($)
Jun. 07, 2016
shares
Aug. 31, 2015
shares
Proceeds from Issuance of Long-term Debt   $ 3,660,505 $ 3,711,225        
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares 2,200,000 1,150,793         2,200,000 1,200,000
Treasury Stock, Shares, Acquired | shares   0            
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              
Promissory Note with BOKF [Member]                
Line of Credit Facility, Maximum Borrowing Capacity $ 10,000,000       $ 15,000,000 $ 10,000,000    
Proceeds from Issuance of Long-term Debt   $ 0 $ 3,700,000          
Line of Credit Facility, Term of the Term Note into which the Principal Balance Will Be Rolled   4 years            
Treasury Stock, Shares, Acquired | shares     520,500          
Line of Credit Facility, Remaining Borrowing Capacity   $ 7,600,000            
Two Promissory Notes with BOKF [Member]                
Debt Instrument, Interest Rate, Effective Percentage   3.351% 2.557%          
Two Promissory Notes with BOKF [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate   1.85%