Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total Par Value Of Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Jun. 30, 2012	$ 6,906	$ 8,476	$ 125,699	$ (1,639)	$ 139,442
Issuance of common stock:
Stock options exercised, net	92	1,197			1,289
Unrealized gain on available for sale investments, net of tax				60	60
Long-term incentive compensation	109	442			551
Stock-based compensation		500			500
Minimum pension liability adjustment, net of tax				488	488
Cash dividends declared			(4,244)		(4,244)
Net income			13,151		13,151
Balance at Jun. 30, 2013	7,107	10,615	134,606	(1,091)	151,237
Issuance of common stock:
Stock options exercised, net	223	2,165			2,388
Unrealized gain on available for sale investments, net of tax				(398)	(398)
Long-term incentive compensation	41	724			765
Stock-based compensation		525			525
Excess tax benefit from stock-based payment arrangements		(1,357)			(1,357)
Minimum pension liability adjustment, net of tax				233	233
Cash dividends declared			(4,362)		(4,362)
Net income			14,990		14,990
Balance at Jun. 30, 2014	7,371	15,386	$ 145,234	$ (1,256)	166,735
Issuance of common stock:
Stock options exercised, net	$ 83	$ 707			790
Unrealized gain on available for sale investments, net of tax				$ (147)	(147)
Long-term incentive compensation	$ 26	$ 1,310			1,336
Stock-based compensation		607			607
Excess tax benefit from stock-based payment arrangements		$ 817			817
Minimum pension liability adjustment, net of tax				$ (333)	(333)
Cash dividends declared			$ (5,357)		(5,357)
Net income			22,299		22,299
Balance at Jun. 30, 2015	$ 7,480	$ 18,827	$ 162,176	$ (1,736)	$ 186,747