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SUMMARY OF ACCOUNTING POLICIES (Details - Key Financial Data on Joint Ventures) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]      
Current assets $ 222,997   $ 270,424
Current liabilities (402,617)   (398,114)
Total net assets 66,458   61,644
Book value of RadNet joint venture interests 30,351   28,079
Cost in excess of book value of acquired joint venture interests and other 6,462   6,449
Total value of RadNet joint venture interests 36,813   34,528
Net revenue 315,319 $ 281,564  
Net income 13,775 (13,998)  
Equity Method Investment, Nonconsolidated Investee or Group of Investees      
Schedule of Equity Method Investments [Line Items]      
Current assets 33,265   27,085
Noncurrent assets 68,493   68,686
Current liabilities (13,929)   (12,545)
Noncurrent liabilities (21,371)   $ (21,582)
Net revenue 31,718 26,341  
Net income $ 4,803 $ 4,245