Quarterly report pursuant to Section 13 or 15(d)

Geographic information (Details)

v3.5.0.2
Geographic information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues - owned units $ 15,282,704 $ 12,778,925 $ 29,662,634 $ 22,504,226  
Management, incentive and royalty fee revenue 1,943,952 2,121,977 3,958,003 4,173,253  
United States          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues - owned units 15,282,704 12,778,925 29,662,634 22,504,226  
Management, incentive and royalty fee revenue 1,338,349 1,496,474 2,794,167 3,000,548  
Net assets 18,247,819   18,247,819   $ 15,167,639
Foreign          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues - owned units 0 0 0 0  
Management, incentive and royalty fee revenue 605,603 $ 625,503 1,163,836 $ 1,172,705  
Net assets $ 3,642,211   $ 3,642,211   $ 4,437,332