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				(1,112)			(1,112)
Net income				8,330			8,330
Other comprehensive loss, net of taxes					(791)		(791)
Balance at Mar. 31, 2017		861	10,990	71,023	(1,516)	(410)	80,948
Balance at Jun. 30, 2017		861	10,990	73,072	(992)	(410)	83,521
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised			60			90	150
Dividends declared				(1,145)			(1,145)
Net income				10,789			10,789
Reclassification adjustment	[1]			259	(259)		0
Other comprehensive loss, net of taxes					(648)		(648)
Balance at Mar. 31, 2018		$ 861	$ 11,050	$ 82,975	$ (1,899)	$ (320)	$ 92,667

[1] Adoption of Accounting Standard Update 2018-02, reclassification 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%.