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)

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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
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Clinics in operation at the end of the period 373 331    
Number of Stores 373 331 373 331
Clinic licenses sold but not yet developed     107 146
Franchised Units [Member]        
Clinics open at beginning of period 309 265    
Opened or purchased during the period 18 14    
Acquired during the period    
Closed during the period (1) (2)    
Clinics in operation at the end of the period 326 277    
Acquired during the period    
Number of Stores 309 265 326 277
Entity Operated Units [Member]        
Clinics open at beginning of period 61 47    
Opened or purchased during the period 7    
Acquired during the period    
Closed during the period (14)    
Clinics in operation at the end of the period 47 54    
Acquired during the period    
Number of Stores 61 47 47 54