SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accounts receivable, gross	$ 3,240	$ 3,181
Less allowance for doubtful accounts	(2,113)	(2,484)
Accounts receivable, net	1,127	697
Medicaid [Member]
Accounts receivable, gross	38	45
Medicare [Member]
Accounts receivable, gross	1,051	727
Self-Pay [Member]
Accounts receivable, gross	212	139
Third-Party Payor [Member]
Accounts receivable, gross	1,683	2,111
Contract Diagnostic Services and Other [Member]
Accounts receivable, gross	$ 256	$ 159