Earnings per Share - Basic (Details) - USD ($)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Components of basic earnings per share:
Weighted average common shares outstanding	3,299,269	3,264,979
Net income available to common stockholders	$ 1,235,045	$ 1,054,758
Basic earnings per share (in dollars per share)	$ 0.37	$ 0.32