Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
 1 Months Ended 9 Months Ended 12 Months Ended
Sep. 14, 2016
Mar. 02, 2016
Jul. 31, 2016
Jun. 30, 2016
Oct. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Preferred Stock, Shares Authorized           10,000,000   10,000,000
Preferred Stock, Par or Stated Value Per Share           $ 0.001   $ 0.001
Common Stock, Shares Authorized           500,000,000   500,000,000
Common Stock, Par or Stated Value Per Share           $ 0.001   $ 0.001
Common Stock, Shares, Outstanding           17,605,675   250,000
Common Stock, Dividends, Per Share, Cash Paid           $ 0.0852    
Dividends, Common Stock, Total         $ 21,300 $ 285,703 $ 170,400  
Stock Issued During Period, Shares, New Issues       15,000,000   15,000,000    
Stock Issued During Period, Value, New Issues       $ 137,358,367        
Payments of Stock Issuance Costs               $ 23,295
Proceeds from Issuance Initial Public Offering           $ 137,358,367 $ 0  
Noninterest Expense Offering Cost       $ 1,681,259        
Beneficial Ownership description     The Companys charter provides that, subject to certain exceptions, no person may beneficially or constructively own more than 9.8%, in value or in number of shares, whichever is more restrictive, of the outstanding shares of any class or series of the Companys capital stock. On June 27, 2016, the Companys board of directors approved a waiver of the 9.8% ownership limit in our charter allowing ZH USA, LLC to own up to 16.9% of the Companys outstanding shares of common stock.          
Common Stock, Dividends, Per Share, Declared $ 0.20              
Dividends Payable           3,592,786   $ 0
IPO [Member]                
Stock Issued During Period, Shares, New Issues       13,043,479        
Shares Issued, Price Per Share       $ 10.00        
Stock Issued During Period, Value, New Issues       $ 130,434,790        
Payments of Stock Issuance Costs       11,272,068        
Proceeds from Issuance Initial Public Offering       $ 119,162,722        
Over-Allotment Option [Member]                
Stock Issued During Period, Shares, New Issues     1,956,521 1,956,521        
Shares Issued, Price Per Share       $ 10.00        
Stock Issued During Period, Value, New Issues     $ 19,565,210 $ 19,565,210        
Payments of Stock Issuance Costs     1,369,565 1,369,565        
Proceeds from Issuance Initial Public Offering     18,195,645 $ 18,195,645        
Noninterest Expense Offering Cost     1,681,259          
ZH USA, LLC [Member]                
Debt Conversion, Original Debt, Amount   $ 15,000,000 $ 15,030,134     $ 30,030,134    
Debt Conversion, Converted Instrument, Shares Issued   1,176,656 1,179,019          
Debt Instrument Convertible, Base for Conversion   $ 12.748 $ 12.748