Consolidated Condensed Statement of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Apr. 30, 2019	10,000,000		(336,439)
Balance at Apr. 30, 2019	$ 1,000	$ 991	$ (4,743)	$ 48,598	$ 1,678	$ 47,524
Net income				12,853		12,853
Change in unrealized gains on securities, net of taxes					332	332
Purchase of treasury stock (in shares)			(24,016)
Purchase of treasury stock			$ (572)			(572)
Dividends declared				(5,791)		(5,791)
Balance (in shares) at Jan. 31, 2020	10,000,000		(360,455)
Balance at Jan. 31, 2020	$ 1,000	991	$ (5,315)	55,660	2,010	54,346
Balance (in shares) at Apr. 30, 2020	10,000,000		(383,279)
Balance at Apr. 30, 2020	$ 1,000	991	$ (5,957)	56,450	1,055	53,539
Net income				16,202		16,202
Change in unrealized gains on securities, net of taxes					921	921
Purchase of treasury stock (in shares)			(37,081)
Purchase of treasury stock			$ (1,045)			(1,045)
Dividends declared				(6,048)		(6,048)
Balance (in shares) at Jan. 31, 2021	10,000,000		(420,360)
Balance at Jan. 31, 2021	$ 1,000	$ 991	$ (7,002)	$ 66,604	$ 1,976	$ 63,569