SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Sales, Net of Collection Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	$ 2,295	$ 2,139	$ 7,268	$ 6,494
Adjustment for allowance for doubtful accounts	(80)	107	(247)	(80)
Net sales	2,215	2,246	7,021	6,414
Medicaid [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	12	4
Adjustment for allowance for doubtful accounts	(6)	(3)	(19)
Net sales	6	1
Medicare [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	936	942
Adjustment for allowance for doubtful accounts	(24)	(47)	(75)
Net sales	912	895
Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	109	65
Net sales	109	65
Third-Party Payor [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	1,003	952
Adjustment for allowance for doubtful accounts	(50)	157	(153)
Net sales	953	1,109
Contract Diagnostic Services [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments		35
Net sales		35
Service revenue, net [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	2,060	1,998	6,291	5,980
Adjustment for allowance for doubtful accounts	(80)	107	(247)	(80)
Net sales	1,980	2,105	6,044	5,900
Service revenue, net [Member] | Medicaid [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	12	4	39	35
Adjustment for allowance for doubtful accounts			(19)	(2)
Net sales			20	33
Service revenue, net [Member] | Medicare [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	936	942	2,986	2,935
Adjustment for allowance for doubtful accounts			(75)	(36)
Net sales			2,911	2,899
Service revenue, net [Member] | Self-Pay [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	109	65	206	181
Net sales			206	181
Service revenue, net [Member] | Third-Party Payor [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	1,003	952	3,060	2,773
Adjustment for allowance for doubtful accounts			(153)	(42)
Net sales			2,907	2,731
Service revenue, net [Member] | Contract Diagnostic Services [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments		35		56
Net sales				56
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	235	141	977	514
Net sales	235	141	$ 977	$ 514
Other [Member] | Clinical Research Grants and Other [Member]
Disaggregation of Revenue [Line Items]
Revenue, net of contractual allowances and adjustments	$ 235	$ 141