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NOTES PAYABLE AND LONG-TERM DEBT (Details)
$ in Thousands, shares in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 20, 2018
Sep. 18, 2015
USD ($)
shares
Jun. 30, 2020
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Instruments [Abstract]              
Proceeds from issuance of long-term debt         $ 402 $ 0  
Long-term Debt [Abstract]              
Total     $ 410   410   $ 0
Line of Credit [Member]              
Long-term Debt [Abstract]              
Line of credit note     410   410   0
Less current maturities     0   0   0
Total     410   410   0
Promissory Notes with BOKF [Member]              
Debt Instruments [Abstract]              
Line of credit facility fair value of amount outstanding     0   0    
Promissory Note And Business Loan Agreement With BOKF Working Capital [Member]              
Debt Instruments [Abstract]              
Line of credit facility maximum borrowing capacity     6,000   $ 6,000    
Line of credit maturity date         Sep. 18, 2021    
Debt instrument interest rate increase (decrease) (0.35%)            
Proceeds from issuance of long-term debt         $ 0   0
Promissory Note And Business Loan Agreement With BOKF Working Capital [Member] | Minimum [Member]              
Debt Instruments [Abstract]              
Debt instrument covenants fixed charge coverage ratio   1.2          
Promissory Note And Business Loan Agreement With BOKF Working Capital [Member] | Maximum [Member]              
Debt Instruments [Abstract]              
Debt instrument covenants EBITDA ratio   1.5          
Promissory Note and Business Loan Agreement with BOKF, Stock Repurchase [Member]              
Debt Instruments [Abstract]              
Line of credit facility maximum borrowing capacity   $ 10,000 15,000   $ 15,000    
Line of credit maturity date         Sep. 18, 2024    
Debt instrument interest rate increase (decrease) (0.35%)            
Line of credit facility term of principal balance rolled         4 years    
Repayments of lines of credit       $ 9,000      
Pre-payment penalties incurred       $ 0      
Promissory Note and Business Loan Agreement with BOKF, Stock Repurchase [Member] | Maximum [Member]              
Debt Instruments [Abstract]              
Stock repurchase program number of shares authorized to be repurchased (in shares) | shares   2.2          
Institute of Official Credit Guarantee for Small and Medium-sized Enterprises [Member]              
Debt Instruments [Abstract]              
Line of credit maturity date         Jun. 04, 2025    
Proceeds from issuance of long-term debt     $ 400        
Term of agreement     5 years        
Fixed interest rate     1.50%   1.50%    
Period required to make monthly interest payments     2 years        
Institute of Official Credit Guarantee for Small and Medium-sized Enterprises [Member] | Line of Credit [Member]              
Long-term Debt [Abstract]              
Line of credit note     $ 410   $ 410   $ 0