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Subsequent events (Details Textual) - USD ($)
1 Months Ended
Jul. 31, 2018
Mar. 31, 2018
Oct. 31, 2017
Feb. 28, 2017
Subsequent Event [Line Items]        
Receivable with Imputed Interest, Due Date     Mar. 31, 2018 Sep. 30, 2017
Receivable with Imputed Interest, Effective Yield (Interest Rate)     1.00% 1.00%
Parent [Member]        
Subsequent Event [Line Items]        
Loans Receivable, Net   $ 306,000 $ 306,000 $ 408,000
Repayment of Notes Receivable from Related Parties   408,000    
Shareholder [Member]        
Subsequent Event [Line Items]        
Loans Receivable, Net   294,000 $ 294,000 $ 392,000
Repayment of Notes Receivable from Related Parties   $ 392,000    
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Receivable with Imputed Interest, Due Date Jun. 30, 2019      
Subsequent Event [Member] | Parent [Member]        
Subsequent Event [Line Items]        
Loans Receivable, Net $ 1,122,000      
Subsequent Event [Member] | Shareholder [Member]        
Subsequent Event [Line Items]        
Loans Receivable, Net $ 1,078,000