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SALES SERVICE REVENUE, NET AND ACCOUNTS RECEIVABLE (Schedule of Receivables) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Accounts receivable, gross $ 3,224 $ 3,390
Less allowance for doubtful accounts (2,366) (2,354)
Accounts receivable, net 858 1,036
Medicaid [Member]    
Accounts receivable, gross 31 34
Medicare [Member]    
Accounts receivable, gross 1,080 1,124
Self-Pay    
Accounts receivable, gross 252 291
Third-Party Payor [Member]    
Accounts receivable, gross 1,446 1,888
Contract Diagnostic Services and Other [Member]    
Accounts receivable, gross $ 415 $ 53