Note 12 - Segment Reporting  | 
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| Notes to Financial Statements | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Segment Reporting Disclosure [Text Block] | 
 An operating segment is defined as a component of an enterprise for which discrete financial information is available and is reviewed regularly by the Chief Operating Decision Maker (“CODM”), to evaluate performance and make operating decisions. The Company has identified its CODM as the Chief Executive Officer.  The Company has   two  operating business segments. The Corporate Clinics segment is comprised of the operating activities of the company-owned or managed clinics. As of  December  31,  2016,  the Company operated or managed 61  clinics under this segment. The Franchise Operations segment is comprised of the operating activities of the franchise business unit. As of  December  31,  2016,  the franchise system consisted of 309  clinics in operation. Corporate is a non-operating segment that develops and implements strategic initiatives and supports the Company’s two  operating business segments by centralizing key administrative functions such as finance and treasury, information technology, insurance and risk management, litigation and human resources. Corporate also provides the necessary administrative functions to support the Company as a publicly traded company. A portion of the expenses incurred by Corporate are allocated to the operating segments. The tables below present financial information for the Company’s   two  operating business segments (in thousands):
 
 “Unallocated cash and cash equivalents and restricted cash” relates primarily to corporate cash and cash equivalents and restricted cash (see Note  
1),  “unallocated property and equipment” relates primarily to corporate fixed assets, and “other unallocated assets” relates primarily to deposits, prepaid and other assets. | 
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