FACILITY ACQUISITIONS (Details - Assets Acquired and Liabilities Assumed) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill	$ 502,331	$ 472,879
Personal Health Imaging PLLC
Business Acquisition [Line Items]
Total Cash Consideration	2,995
Property & Equipment	576
Right of Use Assets	608
Goodwill	2,355
Intangible Assets	50
Other Assets	14
Right of Use Liabilities	(608)
ZP Elmont LLC
Business Acquisition [Line Items]
Total Cash Consideration	2,194
Property & Equipment	1,112
Right of Use Assets	0
Goodwill	1,005
Intangible Assets	50
Other Assets	27
Right of Use Liabilities	0
ZP Freeport LLC
Business Acquisition [Line Items]
Total Cash Consideration	6,065
Property & Equipment	4,668
Right of Use Assets	0
Goodwill	1,328
Intangible Assets	40
Other Assets	29
Right of Use Liabilities	0
Broadway Medical Imaging LLC
Business Acquisition [Line Items]
Total Cash Consideration	1,155
Property & Equipment	1,076
Right of Use Assets	446
Goodwill	6
Intangible Assets	50
Other Assets	23
Right of Use Liabilities	(446)
3235 Hempstead LLC
Business Acquisition [Line Items]
Total Cash Consideration	9,386
Property & Equipment	5,667
Right of Use Assets	0
Goodwill	3,649
Intangible Assets	70
Other Assets	0
Right of Use Liabilities	0
SLZM Realty LLC
Business Acquisition [Line Items]
Total Cash Consideration	13,671
Property & Equipment	4,617
Right of Use Assets	0
Goodwill	8,974
Intangible Assets	80
Other Assets	0
Right of Use Liabilities	0
2012 Sunrise Merrick LLC
Business Acquisition [Line Items]
Total Cash Consideration	11,428
Property & Equipment	2,741
Right of Use Assets	335
Goodwill	8,617
Intangible Assets	70
Other Assets	0
Right of Use Liabilities	(335)
ZP Bayside LLC
Business Acquisition [Line Items]
Total Cash Consideration	3,545
Property & Equipment	3,385
Right of Use Assets	2,191
Goodwill	40
Intangible Assets	50
Other Assets	70
Right of Use Liabilities	(2,191)
ZP Laurelton LLC
Business Acquisition [Line Items]
Total Cash Consideration	2,658
Property & Equipment	2,530
Right of Use Assets	1,418
Goodwill	32
Intangible Assets	50
Other Assets	46
Right of Use Liabilities	(1,418)
ZP Smith LLC
Business Acquisition [Line Items]
Total Cash Consideration	3,978
Property & Equipment	3,581
Right of Use Assets	2,214
Goodwill	347
Intangible Assets	50
Other Assets	0
Right of Use Liabilities	(2,214)
ZP 907 Northern LLC
Business Acquisition [Line Items]
Total Cash Consideration	562
Property & Equipment	507
Right of Use Assets	1,817
Goodwill	5
Intangible Assets	50
Other Assets	0
Right of Use Liabilities	(1,817)
William M. Kelly MD, Inc.
Business Acquisition [Line Items]
Total Cash Consideration	3,750
Property & Equipment	990
Right of Use Assets	1,379
Goodwill	2,710
Intangible Assets	50
Other Assets	0
Right of Use Liabilities	(1,379)
60th Street MRI, LLC
Business Acquisition [Line Items]
Total Cash Consideration	400
Property & Equipment	85
Right of Use Assets	0
Goodwill	290
Intangible Assets	25
Other Assets	0
Right of Use Liabilities	0
ZP Parkchester LLC
Business Acquisition [Line Items]
Total Cash Consideration	263
Property & Equipment	213
Right of Use Assets	311
Goodwill	0
Intangible Assets	50
Other Assets	0
Right of Use Liabilities	(311)
ZP Eastern LLC
Business Acquisition [Line Items]
Total Cash Consideration	2,868
Property & Equipment	2,801
Right of Use Assets	1,951
Goodwill	17
Intangible Assets	50
Other Assets	0
Right of Use Liabilities	(1,951)
Business Acquisitions
Business Acquisition [Line Items]
Total Cash Consideration	64,918
Property & Equipment	34,549
Right of Use Assets	12,670
Goodwill	29,375
Intangible Assets	785
Other Assets	209
Right of Use Liabilities	$ (12,670)