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Note 2 - Notes Payable and Long-term Debt (Details Textual)
3 Months Ended 7 Months Ended 8 Months Ended 12 Months Ended
Aug. 20, 2018
Sep. 18, 2015
USD ($)
shares
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
shares
Mar. 31, 2019
Aug. 20, 2018
Dec. 31, 2018
USD ($)
Aug. 25, 2016
USD ($)
Aug. 24, 2016
USD ($)
Proceeds from Issuance of Long-term Debt, Total     $ 540,940          
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares   2,200,000              
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       $ 541,000          
Line of Credit Facility, Term of the Term Note into which the Principal Balance Will Be Rolled     4 years            
Line of Credit Facility, Fair Value of Amount Outstanding             $ 9,000,000    
Payment for Debt Extinguishment or Debt Prepayment Cost     $ 0            
Treasury Stock, Shares, Acquired | shares       72,400          
Two Promissory Notes with BOKF [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument, Basis Spread on Variable Rate         1.50% 1.85%