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DEBT - Maturities (Details)
Sep. 30, 2019
USD ($)
instrument
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Aggregate maturities of notes payable      
October 2019 - September 2020 $ 124,000    
Total notes payable 124,000    
Aggregate maturities of finance leases:      
October 2019 - September 2020 3,029,000    
October 2020 - September 2021 56,000    
October 2021 - September 2022 41,000    
October 2022 - September 2023 9,000    
Total finance lease liabilities $ 3,135,000   $ 5,833,000
Minimum      
Aggregate maturities of finance leases:      
Interest rate on leases 4.65%    
Maximum      
Aggregate maturities of finance leases:      
Interest rate on leases 5.37%    
Notes payable to finance companies for insurance      
Notes payable      
Number of outstanding notes payable | instrument 1    
Interest rate (as a percent) 4.99% 3.80%  
Aggregate maturities of notes payable      
Total notes payable $ 124,000 $ 1,680,000  
Notes payable to commercial banks      
Notes payable      
Interest rate (as a percent)   5.00%  
Aggregate maturities of notes payable      
Total notes payable   $ 5,975,000