SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Sales, Net of Collection Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	$ 2,111	$ 1,482
less allowance for doubtful accounts	(287)	(266)
Net sales	1,824	1,216
Medicaid [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	13	9
less allowance for doubtful accounts	(8)	(8)
Net sales	5	1
Medicare [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	984	524
less allowance for doubtful accounts	(99)	(79)
Net sales	885	445
Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	47	50
Net sales	47	50
Third Party Payers [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	900	517
less allowance for doubtful accounts	(180)	(179)
Net sales	720	338
Contract Diagnostic Services [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments		358
Net sales		358
Services Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	1,944	1,458
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	167	24
Net sales	167	24
Service revenue, net [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	1,944	1,458
less allowance for doubtful accounts	(287)	(266)
Net sales	$ 1,657	$ 1,192