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, 2018	10,000,000		(308,380)
Balance at Apr. 30, 2018	$ 1,000	$ 991	$ (4,135)	$ 44,902	$ 783	$ 43,541
Net income				8,857		8,857
Change in unrealized gains on securities, net of taxes					345	345
Purchase of treasury stock (in shares)			(15,724)
Purchase of treasury stock			$ (331)			(331)
Dividends declared				(5,521)		(5,521)
Balance (in shares) at Jan. 31, 2019	10,000,000		(324,104)
Balance at Jan. 31, 2019	$ 1,000	991	$ (4,466)	48,238	1,128	46,891
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