ACQUISITIONS, DISPOSITIONS AND BUSINESS VENTURE ACTIVITY (Details - Assets and Liabilities Assumed) - USD ($) $ in Thousands		12 Months Ended
	Aug. 24, 2021	Dec. 31, 2021	Dec. 06, 2021	Dec. 01, 2021	Jun. 01, 2021	May 01, 2021	Apr. 01, 2021	Mar. 01, 2021	Feb. 01, 2021	Dec. 31, 2020	Nov. 01, 2020	Aug. 31, 2020	Mar. 02, 2020	Jan. 02, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill		$ 513,820								$ 472,879					$ 441,973
Personal Health Imaging PLLC
Business Acquisition [Line Items]
Total 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 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 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 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 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 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 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 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 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 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 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 Consideration		2,346	$ 4,404			$ 3,750
Property & Equipment		99	701			990
Right of Use Assets		323	0			1,379
Goodwill		2,197	3,653			2,710
Intangible Assets		50	50			50
Other Assets		0	0			0
Right of Use Liabilities		(323)	$ 0			(1,379)
60th Street MRI, LLC
Business Acquisition [Line Items]
Total 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 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 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)
Tangent Associates LLC
Business Acquisition [Line Items]
Total Consideration	$ 2,025
Property & Equipment	10
Right of Use Assets	0
Goodwill	379
Intangible Assets	1,636
Other Assets	0
Right of Use Liabilities	$ 0
Shares issued (in shares)	67,658
Mid Delaware Imaging P.A.
Business Acquisition [Line Items]
Total Consideration				$ 6,023
Property & Equipment				590
Right of Use Assets				0
Goodwill				5,260
Intangible Assets				150
Other Assets				23
Right of Use Liabilities				$ 0
Olney Open MRI, LLC
Business Acquisition [Line Items]
Total Consideration														$ 1,751
Property & Equipment														849
Right of Use Assets														1,300
Goodwill														602
Intangible Assets														300
Other Assets														0
Right of Use Liabilities														$ (1,300)
MRI of Woodbridge LLC
Business Acquisition [Line Items]
Total Consideration													$ 2,608
Property & Equipment													464
Right of Use Assets													1,081
Goodwill													1,833
Intangible Assets													300
Other Assets													11
Right of Use Liabilities													$ (1,081)
AZ-Tech Radiology and Open MRI, LLC
Business Acquisition [Line Items]
Total Consideration												$ 5,462
Property & Equipment												2,532
Right of Use Assets												7,552
Goodwill												2,882
Intangible Assets												0
Other Assets												48
Right of Use Liabilities												$ (7,552)
ZP Atlantic LLC
Business Acquisition [Line Items]
Total Consideration											$ 8,871
Property & Equipment											7,931
Right of Use Assets											6,181
Goodwill											828
Intangible Assets											50
Other Assets											62
Right of Use Liabilities											(6,181)
ZP Elmhurst LLC
Business Acquisition [Line Items]
Total Consideration											12,269
Property & Equipment											10,681
Right of Use Assets											12,571
Goodwill											1,463
Intangible Assets											50
Other Assets											75
Right of Use Liabilities											$ (12,571)
Business Acquisitions
Business Acquisition [Line Items]
Total Consideration		79,716								30,961
Property & Equipment		35,949								22,457
Right of Use Assets		12,993								28,685
Goodwill		40,864								7,608
Intangible Assets		2,671								700
Other Assets		232								196
Right of Use Liabilities		$ (12,993)								$ (28,685)
Shares issued (in shares)		67,658,000