Income taxes (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2016
Currently payable
Federal
State
Total currently payable
Deferred
Federal	(434)	(85,162)
State
Total deferred	(434)	(85,162)
Less: increase in valuation allowance	434	85,162
Net deferred
Total income taxes