Annual report pursuant to Section 13 and 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)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Clinics open at beginning of period 370      
Clinics in operation at the end of the period 399 370    
Number of Stores 399 370 399 370
Clinics licenses sold but not yet developed     104 115
Executed letters of intent for future clinic licenses     8
Franchised Units [Member]        
Clinics open at beginning of period 309 265    
Opened or purchased during the period 41 56    
Acquired or sold during the period 6 (6)    
Closed or sold during the period (4) (6)    
Clinics in operation at the end of the period 352 309    
Acquired during the period (6) 6    
Number of Stores 309 309 352 309
Entity Operated Units [Member]        
Clinics open at beginning of period 61 47    
Opened or purchased during the period 8    
Acquired or sold during the period (6)    
Closed or sold during the period (14)    
Clinics in operation at the end of the period 47 61    
Acquired during the period 6    
Number of Stores 61 61 47 61