Annual report pursuant to Section 13 and 15(d)

Income taxes Income taxes - Narrative (Details)

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Income taxes Income taxes - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]      
Valuation allowance   $ (12,029,957) $ 0
Decrease in valuation allowance $ 7,700,000 12,000,000  
ASC 740-10 liability   229,000 0
Unrecognized tax benefits   0 0
Undistributed earnings of foreign subsidiaries   1,921,193  
Deferred tax liabilities, unremitted foreign earnings   784,999 0
Deferred tax asset, foreign tax credit carryforwards   384,239 $ 109,957
Federal      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards   15,196,296  
State      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards   12,068,283  
Foreign      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards   $ 418,634