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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact of Adopting ASU | ASU 2018-02 [Member]	[1]			$ 259	$ (259)		$ 0
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
Other comprehensive income (loss), net of taxes					(372)		(372)
Balance at Jun. 30, 2018		861	11,017	86,213	(1,623)	(277)	96,191
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact of Adopting ASU | ASU 2016-01 [Member]	[2]			114	(114)		0
Dividends declared				(2,037)			(2,037)
Net income				17,484			17,484
Other comprehensive income (loss), net of taxes					731		731
Balance at Jun. 30, 2019		$ 861	$ 11,017	$ 101,774	$ (1,006)	$ (277)	$ 112,369

[1] Adoption of Accounting Standard Update 2018-02, reclassification from accumulated other comprehensive loss to retained earnings for stranded tax effects resulting from newly enacted Federal corporate income tax rate from 34% to 21%.

[2] See Note 1 Impact of Recent Accounting Pronouncements - cumulative effect of change in measurement of equity securities.