Stock-Based Compensation (Details)	3 Months Ended	9 Months Ended
	Mar. 31, 2015 $ / shares shares	Mar. 31, 2016 Plan $ / shares shares	Mar. 31, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans | Plan		2
Stock split ratio	2	2	2
Stock Option [Member]
Stock option activity, shares [Roll Forward]
Outstanding at beginning of year (in shares) | shares		95,670	118,870
Exercised (in shares) | shares		(29,700)	(17,200)
Outstanding at period end (in shares) | shares	101,670	65,970	101,670
Exercisable at period end (in shares) | shares	101,670	65,970	101,670
Stock option activity, weighted average exercise price per share [Abstract]
Outstanding at beginning of year (in dollars per share) | $ / shares		$ 6.25	$ 6.25
Exercised (in dollars per share) | $ / shares		6.25	6.25
Outstanding at period end (in dollars per share) | $ / shares	$ 6.25	6.25	6.25
Exercisable at period end (in dollars per share) | $ / shares	$ 6.25	$ 6.25	$ 6.25