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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Accounts receivable, gross | $ 3,390 | $ 3,181
Less allowance for doubtful accounts | (2,354) | (2,484)
Accounts receivable, net | 1,036 | 697
Medicaid [Member] |  |
Accounts receivable, gross | 34 | 45
Medicare [Member] |  |
Accounts receivable, gross | 1,124 | 727
Self-Pay |  |
Accounts receivable, gross | 291 | 139
Third-Party Payor [Member] |  |
Accounts receivable, gross | 1,888 | 2,111
Contract Diagnostic Services [Member] |  |
Accounts receivable, gross | $ 53 | $ 159

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