Stock-Based Compensation (Details)		12 Months Ended
	Mar. 15, 2016	Jun. 30, 2017 USD ($) Plan $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares	Dec. 31, 2008 $ / 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
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized | $		$ 0	$ 0
Stock option activity, weighted average exercise price per share [Abstract]
Options outstanding, intrinsic value | $		791,000	649,000
Options exercisable, intrinsic value | $		791,000	649,000
Options exercised during period, total intrinsic value | $		$ 339,000	$ 339,000
Options granted (in shares)		0	0
Stock Option [Member]
Stock option activity, shares [Roll Forward]
Outstanding at beginning of year (in shares)		64,770	95,670
Exercised (in shares)		(27,000)	(30,900)
Outstanding at year end (in shares)		37,770	64,770
Exercisable at year end (in shares)		37,770	64,770
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 year end (in dollars per share) | $ / shares		6.25	6.25
Exercisable at year end (in dollars per share) | $ / shares		$ 6.25	$ 6.25
2008 Stock Option Plan [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Number of shares authorized under the plan (in shares)		360,000
Options, exercise price (in dollars per share) | $ / shares				$ 6.25
Options, expected term		10 years
Award vesting period		3 years
Stock option activity, weighted average exercise price per share [Abstract]
Options granted (in shares)				329,000