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2. SUMMARY OF ACCOUNTING POLICIES (Details - Key Financial Data on Joint Ventures) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Key financial data for joint ventures      
Current assets - joint ventures $ 16,203 $ 17,026  
Noncurrent assets - joint ventures 49,324 49,163  
Current liabilities - joint ventures (6,158) (7,419)  
Noncurrent liabilities - joint ventures (6,793) (8,997)  
Total net assets -joint ventures 52,576 49,773  
Book value of Radnet joint venture interests 23,705 24,712  
Cost in excess of book value of acquired joint venture interests 4,922 3,511  
Elimination of intercompany profit remaining on Radnet's consolidated balance sheet 322 375  
Total value of Radnet joint venture interests 28,949 28,598  
Total book value of other joint venture partner interests 28,871 25,061  
Net revenue 93,134 85,036 76,076
Net income $ 13,633 $ 14,031 $ 11,655