Earnings per Share - Basic (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Components of basic earnings per share:
Weighted average common shares outstanding	3,284,630	3,285,020	3,289,170	3,260,513
Net income available to common stockholders	$ 275,346	$ 242,494	$ 849,868	$ 739,596
Basic earnings per share (in dollars per share)	$ 0.08	$ 0.07	$ 0.26	$ 0.23