2. SUMMARY OF ACCOUNTING POLICIES (Details - Key Financial Data on Joint Ventures) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Key financial data for joint ventures
Current assets	$ 45,345		$ 47,813
Noncurrent assets	107,228		107,481
Current liabilities	(13,220)		(16,655)
Noncurrent liabilities	(65,686)		(42,072)
Total net assets	73,667		96,567
Book value of RadNet joint venture interests	34,210		45,935
Cost in excess of book value of acquired joint venture interests	7,989		6,500
Total value of RadNet joint venture interests	42,199		52,435
Total book value of other joint venture partner interests	39,457		$ 50,632
Net revenue	136,413	$ 133,108
Net income	$ 20,271	$ 16,034