Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Balance at Jun. 30, 2015	$ 431	$ 11,220	$ 56,696	$ (798)	$ (629)	$ 66,920
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised		76			117	193
Tax benefit of stock based compensation		6				6
2-for-1 stock split	430	(430)				0
Dividends declared			(1,854)			(1,854)
Net income			8,963			8,963
Other comprehensive income, net of taxes				73		73
Balance at Jun. 30, 2016	861	10,872	63,805	(725)	(512)	74,301
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised		67			102	169
Tax benefit of stock based compensation		51				51
Dividends declared			(1,920)			(1,920)
Net income			11,187			11,187
Other comprehensive income, net of taxes				(267)		(267)
Balance at Jun. 30, 2017	$ 861	$ 10,990	$ 73,072	$ (992)	$ (410)	$ 83,521