Quarterly report pursuant to Section 13 or 15(d)

Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Clinics in Operation Under Franchise Agreements or Company-owned or Managed (Details)

v3.19.3
Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Clinics in Operation Under Franchise Agreements or Company-owned or Managed (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Closed during the period 1    
Clinics in operation at the end of the period 488 422 488 422    
Closed during the period (1)    
Total clinics in operation at the end of the period 488 422 488 422 488 422
Clinic licenses sold but not yet developed         179 126
Executed letters of intent for future clinic licenses         29 12
Franchised Units [Member]            
Clinics open at beginning of period 417 365 394 352    
Opened during the period 21 10 47 25    
Sold during the period (6) (7) (1)    
Closed during the period (2) (1) (4) (2)    
Clinics in operation at the end of the period 430 374 430 374    
Opened during the period 21 10 47 25    
Closed during the period 2 1 4 2    
Total clinics in operation at the end of the period 417 365 394 352 430 374
Entity Operated Units [Member]            
Clinics open at beginning of period 51 48 48 47    
Opened during the period 1 4    
Clinics in operation at the end of the period 58 48 58 48    
Opened during the period 1 4    
Acquired during the period 6 7 1    
Total clinics in operation at the end of the period 51 48 48 47 58 48