Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - 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		33			50	83
Tax benefit of stock based compensation		6				6
Dividends declared			(715)			(715)
Net income			4,470			4,470
Other comprehensive loss, net of taxes				(14)		(14)
Balance at Dec. 31, 2015	431	11,259	60,451	(812)	(579)	70,750
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			(742)			(742)
Net income			5,433			5,433
Other comprehensive loss, net of taxes				(833)		(833)
Balance at Dec. 31, 2016	$ 861	$ 10,990	$ 68,496	$ (1,558)	$ (410)	$ 78,379