CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Treasury Stock	AOCI Attributable to Parent	Cumulative Effect, Period of Adoption, Adjustment	Total
Beginning Balance at Jun. 30, 2019	$ 93	$ 94,541		$ 143,677	$ (1,166)	$ 1,247		$ 238,392
Net Income				20,644				20,644
Change in unrealized gain on available for sale securities						261		261
Dividends paid on common stock				(4,144)				(4,144)
Stock option expense		51						51
Stock grant expense		356						356
Exercise of stock options		64						64
Treasury stock purchased					(5,771)			(5,771)
Ending Balance at Mar. 31, 2020	93	95,012		160,177	(6,937)	1,508		249,853
Beginning Balance at Dec. 31, 2019	93	94,650		156,459	(3,980)	1,647		248,869
Net Income				5,099				5,099
Change in unrealized gain on available for sale securities						(139)		(139)
Dividends paid on common stock				(1,381)				(1,381)
Stock option expense		20						20
Stock grant expense		310						310
Exercise of stock options		32						32
Treasury stock purchased					(2,957)			(2,957)
Ending Balance at Mar. 31, 2020	93	95,012		160,177	(6,937)	1,508		249,853
Beginning Balance at Jun. 30, 2020	93	95,035	$ 7,151	165,709	(6,937)	4,447	$ 7,151	258,347
Net Income				33,491				33,491
Change in unrealized gain on available for sale securities						(2,052)		(2,052)
Dividends paid on common stock				(4,171)				(4,171)
Stock option expense		514						514
Common stock issued	1							1
Treasury stock purchased					(6,040)			(6,040)
Ending Balance at Mar. 31, 2021	94	95,549		187,878	(12,977)	2,395		272,939
Beginning Balance at Dec. 31, 2020	93	95,109		177,861	(9,575)	4,201		267,689
Net Income				11,458				11,458
Change in unrealized gain on available for sale securities						(1,806)		(1,806)
Dividends paid on common stock				(1,441)				(1,441)
Stock option expense		440						440
Common stock issued	1							1
Treasury stock purchased					(3,402)			(3,402)
Ending Balance at Mar. 31, 2021	$ 94	$ 95,549		$ 187,878	$ (12,977)	$ 2,395		$ 272,939