Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total Par Value Of Common Shares [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Total
Balance, beginning at Jun. 30, 2021	$ 8,133	$ 34,015	$ (31,320)	$ 157,140	$ 167,968
Stock-based compensation	3	1,159			1,162
Vesting of restricted stock units and restricted shares	7	(257)			(250)
Treasury stock purchases			(1,915)		(1,915)
Cash dividends declared				(1,047)	(1,047)
Net income				4,353	4,353
Balance, ending at Sep. 30, 2021	8,143	34,917	(33,235)	160,446	170,271
Balance, beginning at Jun. 30, 2021	8,133	34,015	(31,320)	157,140	167,968
Net income					2,124
Balance, ending at Mar. 31, 2022	8,159	35,364	(59,278)	156,355	140,600
Balance, beginning at Sep. 30, 2021	8,143	34,917	(33,235)	160,446	170,271
Stock-based compensation	4	1,016			1,020
Vesting of restricted stock units and restricted shares	(2)	(42)			(44)
Stock options exercised, net	8	110			118
Treasury stock purchases			(7,743)		(7,743)
Cash dividends declared				(1,013)	(1,013)
Net income				(7,545)	(7,545)
Balance, ending at Dec. 31, 2021	8,153	36,001	(40,978)	151,888	155,064
Stock-based compensation	6	(637)			(631)
Treasury stock purchases			(18,300)		(18,300)
Cash dividends declared				(849)	(849)
Net income				5,316	5,316
Balance, ending at Mar. 31, 2022	8,159	35,364	(59,278)	156,355	140,600
Balance, beginning at Jun. 30, 2022	8,190	34,467	(66,372)	155,275	131,560
Stock-based compensation	8	817			825
Vesting of restricted stock units and restricted shares	28	(378)			(350)
Treasury stock purchases			(403)		(403)
Cash dividends declared				(833)	(833)
Net income				289	289
Balance, ending at Sep. 30, 2022	8,226	34,906	(66,775)	154,731	131,088
Balance, beginning at Jun. 30, 2022	8,190	34,467	(66,372)	155,275	131,560
Net income					4,617
Balance, ending at Mar. 31, 2023	8,247	36,463	(69,340)	157,433	132,803
Balance, beginning at Sep. 30, 2022	8,226	34,906	(66,775)	154,731	131,088
Stock-based compensation	10	835			845
Vesting of restricted stock units and restricted shares	3	(60)			(57)
Treasury stock purchases			(1,823)		(1,823)
Cash dividends declared				(819)	(819)
Net income				2,853	2,853
Balance, ending at Dec. 31, 2022	8,239	35,681	(68,598)	156,765	132,087
Stock-based compensation	8	794			802
Vesting of restricted stock units and restricted shares		(12)			(12)
Treasury stock purchases			(742)		(742)
Cash dividends declared				(807)	(807)
Net income				1,475	1,475
Balance, ending at Mar. 31, 2023	$ 8,247	$ 36,463	$ (69,340)	$ 157,433	$ 132,803