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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details)							1 Months Ended	3 Months Ended			12 Months Ended
	Mar. 31, 2021 USD ($) Location Clinic State	Nov. 30, 2020 USD ($) Clinic Installment	Sep. 30, 2020 USD ($) Installment Contract	Feb. 27, 2020 USD ($) Partnership Clinic	Apr. 11, 2019 Location State	Apr. 30, 2018 Business	Mar. 31, 2021 USD ($) Location Clinic State	Mar. 31, 2021 USD ($) Volume Location Segment Facility Clinic State	Sep. 30, 2020 USD ($) Contract	Mar. 31, 2020 USD ($) Volume	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 closed clinics sold | Clinic	2						2	2
Aggregate sale price of clinics								$ 100,000
Number of clinics operated | Clinic	564						564	564
Number of states where clinics are operated | State	39						39	39
Number of third party facilities | Facility								40
Average physical therapy patient volumes per day per clinic | Volume								27.1		26.2
Deferment of depositing employer's share of social security taxes included in accrued liabilities and other long-term liabilities	$ 4,200,000						$ 4,200,000	$ 4,200,000
Long-Lived Assets [Abstract]
Impairment of long lived assets								0
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		$ 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	70.00%	75.00%		65.00%			70.00%	70.00%
Number of businesses acquired | Clinic	5	3		4			5
Percentage of interest the founder will retain	30.00%						30.00%	30.00%
Aggregate purchase price for the acquired clinic practices	$ 12,000,000.0	$ 8,900,000		$ 11,900,000			$ 12,000,000.0
Cash paid for acquisition of interest in clinic	11,700,000	8,600,000		11,600,000			11,700,000
Seller notes	$ 300,000	$ 300,000		$ 300,000			$ 300,000	$ 300,000
Percentage of interest accrued	3.25%	3.25%		4.75%			3.25%	3.25%
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%
Aggregate purchase price for the acquired clinic practices			$ 4,200,000
Cash paid for acquisition of interest in clinic			3,700,000
Seller notes			$ 500,000						$ 500,000
Number of installments | Installment			2
Number of management contracts | Contract			6						6
Remaining contract term			5 years						5 years
Management Contracts [Member] | Notes Payable One [Member]
Basis of Presentation [Abstract]
Seller notes			$ 200,000						$ 200,000
Percentage of interest accrued			5.00%						5.00%
Management Contracts [Member] | Notes Payable Two [Member]
Basis of Presentation [Abstract]
Seller notes			$ 300,000						$ 300,000
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%
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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- Definition

Number of regions of the entity operates.

+ References

No definition available.

+ Details

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- Definition

This element represents number of states of network services provided by the company.

+ References

No definition available.

+ Details

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- Definition

Number of third party facilities.

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No definition available.

+ Details

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- Definition

Percentage of combined business interest owned during the period.

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No definition available.

+ Details

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- Definition

Percentage of general partnership interest owned during the period.

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No definition available.

+ Details

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- Definition

Percentage of interest the founder will retain after acquisition of five-clinic physical therapy practice.

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No definition available.

+ Details

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- Definition

Percentage of limited partnership interest owned during the period.

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No definition available.

+ Details

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- Definition

Refers to the commencement period of redemption rights for redeemable non controlling interest.

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No definition available.

+ Details

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- Definition

Relief funds relates to social welfare, a fund of money set up to provide aid for people in need, especially in disaster areas.

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No definition available.

+ Details

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- Definition

Remaining term of contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

The amount of repayment to Medicare Accelerated and Advance Payment Program ("MAAPP Funds") rather than applying them to future services performed.

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No definition available.

+ Details

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