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2. SUMMARY OF ACCOUNTING POLICIES (Details - Key Financial Data on Joint Ventures) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Key financial data for joint ventures      
Current assets $ 40,737   $ 40,093
Noncurrent assets 101,423   100,146
Current liabilities (16,408)   (14,077)
Noncurrent liabilities (42,304)   (44,405)
Total net assets 83,448   81,757
Book value of Radnet joint venture interests 39,741   38,538
Cost in excess of book value of acquired joint venture interests 6,373   4,970
Total value of Radnet joint venture interests 46,114   43,509
Total book value of other joint venture partner interests 43,707   $ 43,219
Net revenue 41,251 $ 39,220  
Net income $ 4,130 $ 5,614