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Note 5 - Notes Payable and Long-term Debt (Details Textual)
2 Months Ended 12 Months Ended
Aug. 20, 2018
Sep. 18, 2015
USD ($)
shares
Feb. 28, 2019
USD ($)
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Aug. 25, 2016
USD ($)
Aug. 24, 2016
USD ($)
Aug. 31, 2015
shares
Proceeds from Issuance of Long-term Debt, Total       $ 1,596,288 $ 3,660,505      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares   2,200,000   907,406         1,200,000
Treasury Stock, Shares, Acquired | shares       243,387 520,482      
London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument, Basis Spread on Variable Rate       1.50% 1.50%        
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       $ 1,600,000 $ 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       235,052          
Line of Credit Facility, Remaining Borrowing Capacity       $ 6,000,000          
Two Promissory Notes with BOKF [Member]                  
Debt Instrument, Interest Rate, Effective Percentage       4.00% 3.351%        
Two Promissory Notes with BOKF [Member] | Subsequent Event [Member]                  
Payment for Debt Extinguishment or Debt Prepayment Cost     $ 0            
Two Promissory Notes with BOKF [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument, Basis Spread on Variable Rate       1.50% 1.85%