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)

v3.10.0.1
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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Clinics in operation at beginning of period 47 47 47 61    
Clinics in operation at the end of the period 413 383 413 383    
Number of Stores 47 47 47 61 413 383
Clinics licenses sold but not yet developed         117 110
Executed letters of intent for future clinic licenses         9
Franchised Units [Member]            
Clinics in operation at beginning of period 359 326 352 309    
Opened or purchased during the period 8 11 15 29    
Acquired during the period (1) (1)    
Closed during the period (1) (1) (1) (2)    
Clinics in operation at the end of the period 365 336 365 336    
Number of Stores 359 326 352 309 365 336
Entity Operated Units [Member]            
Opened or purchased during the period    
Acquired during the period 1 1    
Closed during the period (14)    
Clinics in operation at the end of the period 48 47 48 47    
Number of Stores 48 47 48 47 48 47