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2. SUMMARY OF ACCOUNTING POLICIES (Details - Key Financial Data on Joint Ventures) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Key financial data for joint ventures      
Current assets $ 40,093 $ 28,186  
Noncurrent assets 100,146 91,660  
Current liabilities (14,077) (15,258)  
Noncurrent liabilities (44,405) (44,059)  
Total net assets 81,757 60,529  
Book value of Radnet joint venture interests 38,539 28,397  
Cost in excess of book value of acquired joint venture interests 4,970 4,970  
Elimination of intercompany profit remaining on Radnet's consolidated balance sheet 0 217  
Total value of Radnet joint venture interests 43,509 33,584 $ 32,123
Total book value of other joint venture partner interests 43,218 32,132  
Net revenue 160,134 125,544 101,189
Net income $ 21,933 $ 19,485 $ 14,854