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LEASES - Operating and Financing leases (Details) - USD ($)
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Balance sheet presentation of our operating and financing leases      
Operating lease right-of-use assets $ 627,000 $ 750,000  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Operating lease right-of-use assets    
Finance lease assets $ 193,000    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property, Plant and Equipment, Net    
Total lease assets $ 820,000    
Operating lease obligations, current $ 212,000    
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating lease obligations, current    
Finance lease obligations $ 51,000   $ 57,000
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Finance lease obligations    
Operating lease liabilities, less current maturities $ 421,000    
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Operating lease liabilities, less current maturities    
Finance lease liabilities, less current maturities $ 133,000   $ 155,000
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Finance lease liabilities, less current maturities    
Total lease liabilities $ 817,000