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Note 2 - Notes Payable and Long-term Debt (Details Textual)
8 Months Ended 9 Months Ended
Aug. 20, 2018
Sep. 18, 2015
USD ($)
shares
Aug. 20, 2018
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2017
USD ($)
Aug. 25, 2016
USD ($)
Aug. 24, 2016
USD ($)
Proceeds from Issuance of Long-term Debt, Total       $ 982,939    
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          
Debt Instrument, Interest Rate, Increase (Decrease) (0.35%)            
Proceeds from Issuance of Long-term Debt, Total       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
Debt Instrument, Interest Rate, Increase (Decrease) (0.35%)            
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       133,302      
Line of Credit Facility, Remaining Borrowing Capacity       $ 6,600,000      
Two Promissory Notes with BOKF [Member]              
Debt Instrument, Interest Rate, Effective Percentage       3.70%      
Two Promissory Notes with BOKF [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Basis Spread on Variable Rate     1.85% 1.50%