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 Loss [Member]	Treasury Stock [Member]	Total
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 income (loss), net of taxes					(322)		(322)
Balance at Dec. 31, 2017		861	11,000	79,421	(1,314)	(395)	89,573
Balance at Sep. 30, 2017					(757)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income							3,640
Other comprehensive income (loss), net of taxes					(557)		(557)
Balance at Dec. 31, 2017		861	11,000	79,421	(1,314)	(395)	89,573
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact of Adopting ASU 2016-01					(114)
Impact of Adopting ASU 2016-01 | ASU 2016-01 [Member]	[1]			114	(114)		0
Balance at Jun. 30, 2018		861	11,017	86,213	(1,623)	(277)	96,191
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared				(1,251)			(1,251)
Net income				8,964			8,964
Other comprehensive income (loss), net of taxes					217		217
Balance at Dec. 31, 2018		861	11,017	94,040	(1,520)	(277)	104,121
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact of Adopting ASU 2016-01	[2]				0
Balance at Sep. 30, 2018					(1,813)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income							4,584
Other comprehensive income (loss), net of taxes					293		293
Balance at Dec. 31, 2018		$ 861	$ 11,017	$ 94,040	$ (1,520)	$ (277)	$ 104,121

[1] See Note 9 Impact of Recent Accounting Pronouncements - cumulative effect of change in measurement of equity securities.

[2] Adoption of ASU 2016-01 - cumulative effect of change in measurement of equity securities.