SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts receivable, gross	$ 4,887	$ 3,248
Less allowance for doubtful accounts	(4,013)	(2,674)
Accounts receivable, net	874	574
Medicaid [Member]
Accounts receivable, gross	131	107
Medicare [Member]
Accounts receivable, gross	1,054	814
Self-Pay [Member]
Accounts receivable, gross	276	88
Third Party Payer [Member]
Accounts receivable, gross	3,373	2,203
Contract Diagnostic Services [Member]
Accounts receivable, gross	$ 53	$ 36