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, 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 loss, net of taxes					(267)		(267)
Balance at Jun. 30, 2017		861	10,990	73,072	(992)	(410)	83,521
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised			27			133	160
Dividends declared				(1,526)			(1,526)
Net income				14,408			14,408
Reclassification adjustment	[1]			259	(259)		0
Other comprehensive loss, net of taxes					(372)		(372)
Balance at Jun. 30, 2018		$ 861	$ 11,017	$ 86,213	$ (1,623)	$ (277)	$ 96,191

[1] Adoption of Accounting Standard Update 2018-02, reclassification of ($316) for net losses and past service liability for defined benefit plan and $57 for unrealized gains on available for sale securities from accumulated other comprehensive loss to retained earnings for stranded tax effects resulting from the newly enacted Federal corporate income tax rate from 34% to 21%.