SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Sales, Net of Collection Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	$ 2,446	$ 2,244	$ 4,973	$ 4,355
Adjustment for allowance for doubtful accounts	(87)	100	(167)	(187)
Net sales	2,359	2,344	4,806	4,168
Medicaid [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	12	18
Adjustment for allowance for doubtful accounts	(6)	10	(13)
Net sales	6	28
Medicare [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	1,076	1,009
Adjustment for allowance for doubtful accounts	(27)	110	(51)
Net sales	1,049	1,119
Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	48	69
Net sales	48	69
Third-Party Payor [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	1,090	921
Adjustment for allowance for doubtful accounts	(54)	(20)	(103)
Net sales	1,036	901
Contract Diagnostic Services [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments		21
Net sales		21
Service revenue, net [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	2,226	2,038	4,231	3,982
Adjustment for allowance for doubtful accounts	(87)	100	(167)	(187)
Net sales	2,139	2,138	4,064	3,795
Service revenue, net [Member] | Medicaid [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	12	18	27	31
Adjustment for allowance for doubtful accounts			(13)	1
Net sales			14	32
Service revenue, net [Member] | Medicare [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	1,076	1,009	2,050	1,993
Adjustment for allowance for doubtful accounts			(51)	11
Net sales			1,999	2,004
Service revenue, net [Member] | Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	48	69	97	116
Net sales			97	116
Service revenue, net [Member] | Third-Party Payor [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	1,090	921	2,057	1,821
Adjustment for allowance for doubtful accounts			(103)	(199)
Net sales			1,954	1,622
Service revenue, net [Member] | Contract Diagnostic Services [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments		21		21
Net sales				21
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	220	206	742	373
Net sales	220	206	$ 742	$ 373
Other [Member] | Clinical Research Grants and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	$ 220	$ 206