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2. SUMMARY OF ACCOUNTING POLICIES (Details - Key Financial Data on Joint Ventures) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Key financial data for joint ventures      
Current assets $ 47,813 $ 40,093  
Noncurrent assets 107,481 100,146  
Current liabilities (16,655) (14,077)  
Noncurrent liabilities (42,072) (44,405)  
Total net assets 96,567 81,757  
Book value of RadNet joint venture interests 45,935 38,539  
Cost in excess of book value of acquired joint venture interests accounted for as equity method goodwill 6,500 4,970  
Total value of RadNet joint venture interests 52,435 43,509 $ 33,584
Total book value of other joint venture partner interests 50,632 43,218  
Net revenue 188,849 160,134 125,544
Net income $ 28,644 $ 21,933 $ 19,485