Quarterly report pursuant to Section 13 or 15(d)

Geographic information (Details)

v3.7.0.1
Geographic information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues - owned units $ 18,112,982 $ 14,379,930  
Management, incentive and royalty fee revenue 2,313,716 2,014,051  
United States:      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues - owned units 18,112,982 14,379,930  
Management, incentive and royalty fee revenue 1,836,123 1,455,818  
Net assets 3,559,570   $ 3,899,627
Foreign:      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Management, incentive and royalty fee revenue 477,593 $ 558,233  
Net assets $ 3,293,310   $ 3,478,911