Quarterly report pursuant to Section 13 or 15(d)

Geographic information (Details)

v3.7.0.1
Geographic information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues - owned units $ 17,113,844 $ 15,282,704 $ 35,226,826 $ 29,662,634  
Management, incentive and royalty fee revenue 2,784,659 1,943,952 5,098,375 3,958,003  
United States:          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues - owned units 17,113,844 15,282,704 35,226,826 29,662,634  
Management, incentive and royalty fee revenue 1,701,648 1,338,349 3,537,771 2,794,167  
Net assets 926,418   926,418   $ 3,899,627
Foreign:          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Management, incentive and royalty fee revenue 1,083,011 $ 605,603 1,560,604 $ 1,163,836  
Net assets $ 4,274,377   $ 4,274,377   $ 3,478,911