Quarterly report pursuant to Section 13 or 15(d)

Nonconsolidated variable interest entities - Narrative (Details)

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Nonconsolidated variable interest entities - Narrative (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
operating_restaurant_company
Dec. 31, 2016
USD ($)
Dec. 31, 2011
entity
Schedule of Equity Method Investments [Line Items]      
Number of entities formed | entity     3
Due from related parties, net $ 26,367 $ 415,773  
Bagatelle NY LA Investors, LLC (Bagatelle Investors)      
Schedule of Equity Method Investments [Line Items]      
Number operating restaurant companies | operating_restaurant_company 2    
Ownership percentage 31.24% 31.24%  
Bagatelle Little West 12th, LLC ( Bagatelle NY)      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 5.23% 5.23%  
Indirect ownership percentage 45.90% 45.90%  
Effective ownership percentage 51.13% 51.13%  
Bagatelle La Cienega, LLC (Bagatelle LA)      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 5.23% 5.23%  
Indirect ownership percentage 38.10% 38.10%  
Effective ownership percentage 43.33% 43.33%  
One 29 Park, LLC (One 29 Park)      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 10.00% 10.00%  
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure      
Schedule of Equity Method Investments [Line Items]      
Due from related parties, net $ 336,163 $ 467,702