LEASES - Operating and Financing leases (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Balance sheet presentation of our operating and financing leases
Operating lease right-of-use assets	$ 463,000	$ 519,000	$ 750,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Operating lease right-of-use assets
Finance lease assets	$ 167,000	184,000
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, Plant and Equipment, Net
Total lease assets	$ 630,000	703,000
Operating lease obligations, current	$ 212,000	209,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Operating lease obligations, current
Finance lease obligations	$ 36,000	52,000
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Finance lease obligations
Operating lease liabilities, less current maturities	$ 263,000	317,000
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Operating lease liabilities, less current maturities
Finance lease liabilities, less current maturities	$ 112,000	119,000
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Finance lease liabilities, less current maturities
Total lease liabilities	$ 623,000	$ 697,000