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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details)									1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) Clinic Location State	Jun. 30, 2021 USD ($) Clinic	Mar. 31, 2021 USD ($) Clinic	Nov. 30, 2020 USD ($) Installment Clinic	Sep. 30, 2020 USD ($) Contract Installment	Feb. 27, 2020 USD ($) Clinic Partnership	Apr. 11, 2019 State Location	Apr. 30, 2018 Business	Mar. 31, 2021 USD ($) Clinic	Sep. 30, 2021 USD ($) Clinic Location State	Sep. 30, 2020 USD ($) Contract	Sep. 30, 2021 USD ($) Location Clinic Segment Facility State	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) Region	Dec. 31, 2019 Region	Mar. 31, 2017
Basis of Presentation [Abstract]
Number of reportable segments | Segment												2
Percentage of general partnership interest owned												1.00%
Number of businesses acquired | Clinic		8
Number of closed clinics sold | Clinic	2									2		2
Aggregate sale price of clinics												$ 100,000
Number of clinics operated | Clinic	579									579		579
Number of states where clinics are operated | State	39									39		39
Number of third party facilities | Facility												35
Revenues										$ 123,580,000	$ 106,925,000	$ 357,578,000	$ 299,759,000
Deferment of depositing employer's share social security taxes included in accrued liabilities	$ 4,100,000									4,100,000		4,100,000
Deferment of depositing employer's share social security taxes other long-term liabilities	4,200,000									4,200,000		4,200,000
Relief funds										0	390,000	0	8,349,000
Long-Lived Assets [Abstract]
Impairment of long lived assets to be disposed of												0
Goodwill [Abstract]
Number of regions | Region														6	6
Derecognition (write-off) of goodwill - closed clinics										0	$ 0	0	$ 1,859,000	$ 1,859,000
Income Taxes [Abstract]
Unrecognized tax benefit												0
Accrued interest and penalties associated with any unrecognized tax benefits	0									0		0
Interest expense recognized												$ 0
Segment Reporting [Abstract]
Number of operating segments | Segment												2
Medicare Accelerated and Advance Payments Program [Member]
Basis of Presentation [Abstract]
Repayment of funds	14,100,000									14,100,000		$ 14,100,000
Public Health and Social Services Emergency Fund [Member]
Basis of Presentation [Abstract]
Grants and other funds	100,000,000,000.0									100,000,000,000.0		100,000,000,000.0
Funds received	13,500,000									13,500,000		13,500,000
Relief funds												0
Clinic Practice [Member]
Basis of Presentation [Abstract]
Percentage of interest acquired		65.00%	70.00%	75.00%		65.00%			70.00%
Number of businesses acquired | Clinic		8	5	3		4			5
Percentage of interest the founder will retain		35.00%	30.00%						30.00%
Aggregate purchase price for the acquisition		$ 10,300,000	$ 12,000,000.0	$ 8,900,000		$ 11,900,000			$ 12,000,000.0
Cash paid for acquisition		9,000,000.0	11,700,000	8,600,000		11,600,000			11,700,000
Payable for achievement of certain business criteria		1,000,000.0
Seller notes		$ 300,000	$ 300,000	$ 300,000		$ 300,000			$ 300,000
Percentage of interest accrued		3.25%	3.25%	3.25%		4.75%			3.25%
Contingent payment consideration		$ 800,000
Number of installments | Installment				2
Principal installments				$ 162,500
Number of partnerships | Partnership						4
IIPS [Member]
Basis of Presentation [Abstract]
Percentage of interest acquired							100.00%	65.00%								55.00%
Number of businesses merged | Business								2
Percentage of combined business interest owned							76.00%	59.45%
Number of states of network services | State							45
Number of onsite client locations | Location							11
Management Contracts [Member]
Basis of Presentation [Abstract]
Percentage of interest acquired					70.00%						70.00%		70.00%
Aggregate purchase price for the acquisition					$ 4,200,000
Cash paid for acquisition					3,700,000
Seller notes					$ 500,000						$ 500,000		$ 500,000
Number of installments | Installment					2
Number of management contracts | Contract					6						6
Management Contracts [Member] | Notes Payable One [Member]
Basis of Presentation [Abstract]
Seller notes				$ 300,000
Management Contracts [Member] | Notes Payable Two [Member]
Basis of Presentation [Abstract]
Seller notes	200,000									200,000		200,000
Return-to-work and Ergonomic Services [Member]
Basis of Presentation [Abstract]
Aggregate purchase price for the acquisition	2,700,000
Cash paid for acquisition	2,400,000
Seller notes	$ 300,000									$ 300,000		$ 300,000
Percentage of interest accrued	3.25%									3.25%		3.25%
Contingent payment consideration	$ 600,000									$ 600,000		$ 600,000
Asset purchase price												$ 3,300,000
Briotix Health [Member]
Basis of Presentation [Abstract]
Percentage of combined business interest owned	85.00%
Employee [Member]
Restricted Stock [Abstract]
Period in which restrictions lapse on stock granted												4 years
Director [Member]
Restricted Stock [Abstract]
Period in which restrictions lapse on stock granted												1 year
Officer [Member]
Restricted Stock [Abstract]
Period in which restrictions lapse on stock granted												4 years
Minimum [Member]
Basis of Presentation [Abstract]
Percentage of limited partnership interest owned												49.00%
Redeemable Non-Controlling Interests [Abstract]
Redeemable non-controlling interest, redemption rights, commencement period												3 years
Minimum [Member] | Furniture & Equipment [Member]
Long-Lived Assets [Abstract]
Estimated useful lives												3 years
Minimum [Member] | Software [Member]
Long-Lived Assets [Abstract]
Estimated useful lives												3 years
Minimum [Member] | Leasehold Improvements [Member]
Long-Lived Assets [Abstract]
Estimated useful lives												3 years
Minimum [Member] | Clinic Practice [Member]
Basis of Presentation [Abstract]
Percentage of interest acquired						10.00%
Minimum [Member] | Return-to-work and Ergonomic Services [Member]
Basis of Presentation [Abstract]
Revenues														$ 2,000,000.0
Maximum [Member]
Basis of Presentation [Abstract]
Percentage of limited partnership interest owned												99.00%
Number of operating clinic locations | Location	1									1		1
Redeemable Non-Controlling Interests [Abstract]
Redeemable non-controlling interest, redemption rights, commencement period												5 years
Maximum [Member] | Furniture & Equipment [Member]
Long-Lived Assets [Abstract]
Estimated useful lives												8 years
Maximum [Member] | Software [Member]
Long-Lived Assets [Abstract]
Estimated useful lives												7 years
Maximum [Member] | Leasehold Improvements [Member]
Long-Lived Assets [Abstract]
Estimated useful lives												5 years
Maximum [Member] | Clinic Practice [Member]
Basis of Presentation [Abstract]
Percentage of interest acquired						83.80%

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