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NOTES PAYABLE AND AMENDED CREDIT AGREEMENT (Details) |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2018 USD ($) Installment | Feb. 28, 2018 USD ($) Clinic | Nov. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Jan. 31, 2016 USD ($) | Jun. 30, 2018 USD ($) Clinic | Dec. 31, 2017 Clinic | Dec. 05, 2013 USD ($)
Debt Instruments [Abstract] |  |  |  |  |  |  |  |
Number of clinic practices acquired | Clinic |  | 2 |  |  |  | 2 | 2 |
Aggregate principal payment due in 2018 |  |  |  |  |  | $ 4,817,000 |  |
Aggregate principal payment due in 2019 |  |  |  |  |  | 607,000 |  |
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 |  |  |  |  |  |  |
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 |  |  |  |  |  | $ 628,000 |  |
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 |  |  |  |  |  |  |
Number of principal installments | Installment | 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 |  |  |  |  |  | $ 69,000,000 |  |
Average effective interest rate |  |  |  |  |  | 3.80% |  |
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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