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, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Clinics in operation at beginning of period 47 61    
Clinics in operation at the end of the period 406 373    
Number of Stores 47 61 406 373
Clinics licenses sold but not yet developed     114 107
Executed letters of intent for future clinic licenses     8
Franchised Units [Member]        
Clinics in operation at beginning of period 352 309    
Opened or Purchased during the period 7 18    
Acquired during the period    
Closed during the period (1)    
Clinics in operation at the end of the period 359 326    
Number of Stores 352 309 359 326
Entity Operated Units [Member]        
Opened or Purchased during the period    
Acquired during the period    
Closed during the period (14)    
Clinics in operation at the end of the period 47 47    
Number of Stores 47 47 47 47