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NOTES PAYABLE AND AMENDED CREDIT AGREEMENT (Details)				1 Months Ended			9 Months Ended	12 Months Ended
	Aug. 31, 2018 USD ($) Clinic Installment	Apr. 30, 2018 USD ($) Installment	Feb. 28, 2018 USD ($) Clinic	Nov. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)	Sep. 30, 2018 USD ($) Clinic	Dec. 31, 2017 Clinic	Dec. 05, 2013 USD ($)
Debt Instruments [Abstract]
Number of clinic practices acquired | Clinic	4		2				2	2
Aggregate principal payment due in 2018							$ 4,769,000
Aggregate principal payment due in 2019							659,000
Industrial Injury Prevention [Member] | April 2019 [Member]
Debt Instruments [Abstract]
Acquisition cost payable in installments including accrued interest		$ 200,000
Industrial Injury Prevention [Member] | April 2020 [Member]
Debt Instruments [Abstract]
Acquisition cost payable in installments including accrued interest		200,000
Industrial Injury Prevention [Member] | August 2019 [Member]
Debt Instruments [Abstract]
Acquisition cost payable in installments including accrued interest	$ 200,000
Industrial Injury Prevention [Member] | August 2020 [Member]
Debt Instruments [Abstract]
Acquisition cost payable in installments including accrued interest	$ 200,000
Notes Payable [Member]
Debt Instruments [Abstract]
Average effective interest rate	5.00%
Notes Payable [Member] | 2017 Acquisition [Member]
Debt Instruments [Abstract]
Aggregate amount of notes payable							2,200,000
Aggregate principal payment due in 2018							1,300,000
Aggregate principal payment due in 2019							900,000
Payment of debt							$ 1.0
Notes Payable [Member] | 2018 Acquisition [Member]
Debt Instruments [Abstract]
Aggregate amount of notes payable			$ 150,000
Average effective interest rate			4.50%
Notes Payable [Member] | Industrial Injury Prevention [Member]
Debt Instruments [Abstract]
Aggregate amount of notes payable	$ 400,000	$ 400,000
Number of principal installments | Installment	2	2
Minimum [Member]
Debt Instruments [Abstract]
Spread on Libor variable rate							1.25%
Spread on variable rate							0.10%
Percentage of unused commitment fee							0.25%
Minimum [Member] | Notes Payable [Member]
Debt Instruments [Abstract]
Average effective interest rate							3.25%
Maximum [Member]
Debt Instruments [Abstract]
Spread on Libor variable rate							2.00%
Spread on variable rate							1.00%
Percentage of unused commitment fee							0.30%
Maximum [Member] | Notes Payable [Member]
Debt Instruments [Abstract]
Average effective interest rate							4.75%
Credit Facility [Member]
Debt Instruments [Abstract]
Revolving credit facility commitment									$ 125,000,000
Revolving credit facility maturity date							Nov. 30, 2021
Remaining revolving credit outstanding							$ 71,000,000
Average effective interest rate							4.00%
Credit Agreement [Member]
Debt Instruments [Abstract]
Cash and noncash consideration with respect to acquisition after amendment						$ 50,000,000
Credit Agreement [Member] | Maximum [Member]
Debt Instruments [Abstract]
Cash dividends after amendment				$ 20,000,000	$ 15,000,000	$ 10,000,000

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