Quarterly report pursuant to Section 13 or 15(d)

Geographic information (Details)

v3.5.0.2
Geographic information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues - owned units $ 16,317,636 $ 13,314,507 $ 45,980,270 $ 35,818,733  
Management, incentive and royalty fee revenue 2,061,964 1,939,376 6,019,967 6,112,629  
United States:          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues - owned units 16,317,636 13,314,507 45,980,270 38,818,733  
Management, incentive and royalty fee revenue 1,496,612 1,384,556 4,290,779 4,385,104  
Net assets 20,188,881   20,188,881   $ 15,167,642
Foreign:          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues - owned units 0 0 0 0  
Management, incentive and royalty fee revenue 565,352 $ 554,820 1,729,188 $ 1,727,525  
Net assets $ 3,776,626   $ 3,776,626   $ 4,437,332