LEASES - Operating and Financing leases (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Balance sheet presentation of our operating and financing leases
Operating lease right-of-use assets, net	$ 812	$ 858
Finance lease right-of-use assets, net	337	371
Total lease assets	1,149	1,229
Current maturities of operating lease liabilities	162	166
Current maturities of finance lease liabilities	195	222
Operating lease liabilities, less current maturities	656	697
Finance lease liabilities, less current maturities	130	159
Total lease liabilities	1,143	1,244
HemeScreen Reagent Rental [Member]
Balance sheet presentation of our operating and financing leases
Finance lease right-of-use assets, net	$ 48	$ 61