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Lawsuits and complaints (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 18, 2020
Disclosure of lawsuits and complaints [Line Items]    
Term at which Department of Justice agreed not to prosecute those charges against Company 3 years  
External monitor, term 24 months  
Lawsuits, nominal value $ 515,000  
Lawsuit fifteen [Member]    
Disclosure of lawsuits and complaints [Line Items]    
Lawsuits, nominal value 713,000 $ 436,000,000
Department of Justice [Member]    
Disclosure of lawsuits and complaints [Line Items]    
Legal proceedings, amount agreed to pay $ 15,487,500