Earnings per Share - Diluted (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Components of diluted earnings per share:
Weighted average common shares outstanding	3,284,630	3,285,020	3,289,170	3,260,513
Dilutive effect of net additional shares from restricted stock awards	53,546	25,927	48,058	25,834
Weighted average number of shares outstanding	3,338,176	3,310,947	3,337,228	3,286,347
Net income available to common stockholders	$ 275,346	$ 242,494	$ 849,868	$ 739,596
Diluted earnings per share (in dollars per share)	$ 0.08	$ 0.07	$ 0.25	$ 0.23