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 Income [Member]	Treasury Stock [Member]	Total
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
Balance at Jun. 30, 2017	861	10,990	73,072	(992)	(410)	83,521
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised		10			15	25
Dividends declared			(763)			(763)
Net income			7,112			7,112
Other comprehensive loss, net of taxes				(322)		(322)
Balance at Dec. 31, 2017	$ 861	$ 11,000	$ 79,421	$ (1,314)	$ (395)	$ 89,573