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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue, net of contractual allowances and adjustments $ 2,244 $ 1,645 $ 4,355 $ 3,127
Adjustment for allowance for doubtful accounts 100 (337) (187) (603)
Net sales 2,344 1,308 4,168 2,524
Medicaid [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, net of contractual allowances and adjustments 18 16 31 25
Adjustment for allowance for doubtful accounts 10 (16) 1 (24)
Net sales 28   32 1
Medicare [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, net of contractual allowances and adjustments 1,009 643 1,993 1,168
Adjustment for allowance for doubtful accounts 110 (97) 11 (175)
Net sales 1,119 546 2,004 993
Self-Pay [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, net of contractual allowances and adjustments 69 86 116 136
Net sales 69 86 116 136
Third Party Payers [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, net of contractual allowances and adjustments 921 847 1,821 1,363
Adjustment for allowance for doubtful accounts (20) (224) (199) (404)
Net sales 901 623 1,622 959
Contract Diagnostic Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, net of contractual allowances and adjustments 21 24 21 382
Net sales 21 24 21 382
Services Revenue, Net [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, net of contractual allowances and adjustments 2,038 1,616 3,982 3,074
Service revenue, net [Member]        
Disaggregation of Revenue [Line Items]        
Revenue, net of contractual allowances and adjustments 2,038 1,616 3,982 3,074
Adjustment for allowance for doubtful accounts 100 (337) (187) (603)
Net sales $ 2,138 $ 1,279 $ 3,795 $ 2,471