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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details)
 3 Months Ended 12 Months Ended
Apr. 30, 2018
USD ($)
Feb. 28, 2018
Clinic
Mar. 31, 2018
USD ($)
Clinic
State
Facility
Segment
Region
Dec. 31, 2017
USD ($)
Clinic
Depreciation Amortization Impairment [Line Items]        
Percentage of general partnership interest owned     1.00%  
Number of clinic practices acquired | Clinic   2 2 2
Number of clinics consolidated with an existing clinic | Clinic       1
Number of clinics that operate as a satellite clinic with existing partnerships | Clinic       1
Number of clinics operated | Clinic     580  
Number of states where clinics are operated | State     42  
Number of third party facilities | Facility     28  
Mandatorily redeemable non-controlling interests     $ 0 $ 327,000
Number of business segments | Segment     1  
Number of regions | Region     6  
Corporate income tax rate     21.00%  
Unrecognized tax benefit     $ 0  
Accrued interest and penalties associated with any unrecognized tax benefits     0  
Interest expense recognized     $ 0  
March 2017 Acquisition [Member]        
Depreciation Amortization Impairment [Line Items]        
Percentage of interest acquired     55.00%  
Industrial Injury Prevention [Member] | Subsequent Event [Member]        
Depreciation Amortization Impairment [Line Items]        
Percentage of interest acquired 65.00%      
Value of interest acquired $ 9,000,000      
Employee [Member]        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Period in which restrictions lapse on stock granted     4 years  
Director [Member]        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Period in which restrictions lapse on stock granted     1 year  
Officer [Member]        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Period in which restrictions lapse on stock granted     4 years  
Minimum [Member]        
Depreciation Amortization Impairment [Line Items]        
Percentage of limited partnership interest owned     49.00%  
Redeemable non-controlling interest, redemption rights, commencement period     3 years  
Minimum [Member] | Furniture & Equipment [Member]        
Depreciation Amortization Impairment [Line Items]        
Estimated useful lives     3 years  
Minimum [Member] | Software [Member]        
Depreciation Amortization Impairment [Line Items]        
Estimated useful lives     3 years  
Minimum [Member] | Leasehold Improvements [Member]        
Depreciation Amortization Impairment [Line Items]        
Estimated useful lives     3 years  
Maximum [Member]        
Depreciation Amortization Impairment [Line Items]        
Percentage of limited partnership interest owned     99.00%  
Redeemable non-controlling interest, redemption rights, commencement period     5 years  
Maximum [Member] | Furniture & Equipment [Member]        
Depreciation Amortization Impairment [Line Items]        
Estimated useful lives     8 years  
Maximum [Member] | Software [Member]        
Depreciation Amortization Impairment [Line Items]        
Estimated useful lives     7 years  
Maximum [Member] | Leasehold Improvements [Member]        
Depreciation Amortization Impairment [Line Items]        
Estimated useful lives     5 years