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Note 2 - Notes Payable and Long-term Debt (Details Textual)
6 Months Ended
Sep. 18, 2015
USD ($)
shares
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2017
USD ($)
Dec. 31, 2017
Aug. 25, 2016
USD ($)
Aug. 24, 2016
USD ($)
Proceeds from Issuance of Long-term Debt, Total   $ 982,938      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares 2,200,000          
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, Total   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, Total   $ 983,000 $ 0      
Line of Credit Facility, Term of the Term Note into which the Principal Balance Will Be Rolled   4 years        
Treasury Stock, Shares, Acquired | shares   133,295        
Line of Credit Facility, Remaining Borrowing Capacity   $ 6,600,000        
Two Promissory Notes with BOKF [Member]            
Debt Instrument, Interest Rate, Effective Percentage   3.934%   3.351%    
Two Promissory Notes with BOKF [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate   1.85%