2. SIGNIFICANT ACCOUNTING POLICIES (Details - Goodwill) $ in Thousands	6 Months Ended
Jun. 30, 2017 USD ($)
Goodwill, beginning balance	$ 239,553
Goodwill, ending balance	244,464
Resolution Imaging Medical Corp [Member]
Goodwill acquired through acquisitions	1,901
MRI Centers of Torrance [Member]
Goodwill acquired through acquisitions	401
Santa Monica Imaging Group JV [Member]
Goodwill disposed through the transfer	(1,901)
D&D Diagnostics, Inc [Member]
Goodwill acquired through acquisitions	1,519
Stockton MRI, Inc [Member]
Goodwill acquired through acquisitions	3,101
Hematology Oncology [Member]
Goodwill disposed through sale	$ (110)

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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