Consolidated Condensed Statement of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock, Common [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Apr. 30, 2022	10,000,000		(490,157)
Balance at Apr. 30, 2022	$ 1,000	$ 991	$ (9,967)	$ 87,645	$ (24)	$ 79,645
Net income				4,458		4,458
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent					5	5
Purchase of treasury stock (in shares)			(35,029)
Purchase of treasury stock			$ (2,382)			(2,382)
Dividends declared				(2,369)		(2,369)
Balance (in shares) at Jul. 31, 2022	10,000,000		(525,186)
Balance at Jul. 31, 2022	$ 1,000	991	$ (12,349)	89,734	(19)	79,357
Balance (in shares) at Apr. 30, 2022	10,000,000		(490,157)
Balance at Apr. 30, 2022	$ 1,000	991	$ (9,967)	87,645	(24)	79,645
Net income						8,788
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent						2
Balance (in shares) at Oct. 31, 2022	10,000,000		(542,500)
Balance at Oct. 31, 2022	$ 1,000	991	$ (13,449)	91,700	(22)	80,220
Balance (in shares) at Apr. 30, 2022	10,000,000		(490,157)
Balance at Apr. 30, 2022	$ 1,000	991	$ (9,967)	87,645	(24)	79,645
Balance (in shares) at Apr. 30, 2023	10,000,000		(565,460)
Balance at Apr. 30, 2023	$ 1,000	991	$ (14,671)	95,979	374	83,673
Balance (in shares) at Jul. 31, 2022	10,000,000		(525,186)
Balance at Jul. 31, 2022	$ 1,000	991	$ (12,349)	89,734	(19)	79,357
Net income				4,330		4,330
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent					(3)	(3)
Purchase of treasury stock (in shares)			(17,314)
Purchase of treasury stock			$ (1,100)			(1,100)
Dividends declared				(2,364)		(2,364)
Balance (in shares) at Oct. 31, 2022	10,000,000		(542,500)
Balance at Oct. 31, 2022	$ 1,000	991	$ (13,449)	91,700	(22)	80,220
Balance (in shares) at Apr. 30, 2023	10,000,000		(565,460)
Balance at Apr. 30, 2023	$ 1,000	991	$ (14,671)	95,979	374	83,673
Net income				4,859		4,859
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent					(212)	(212)
Purchase of treasury stock (in shares)			(4,011)
Purchase of treasury stock			$ (188)			(188)
Dividends declared				(2,641)		(2,641)
Balance (in shares) at Jul. 31, 2023	10,000,000		(569,471)
Balance at Jul. 31, 2023	$ 1,000	991	$ (14,859)	98,197	162	85,491
Balance (in shares) at Apr. 30, 2023	10,000,000		(565,460)
Balance at Apr. 30, 2023	$ 1,000	991	$ (14,671)	95,979	374	83,673
Net income						8,347
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent						(660)
Balance (in shares) at Oct. 31, 2023	10,000,000		(573,017)
Balance at Oct. 31, 2023	$ 1,000	991	$ (15,009)	99,046	(286)	85,742
Balance (in shares) at Jul. 31, 2023	10,000,000		(569,471)
Balance at Jul. 31, 2023	$ 1,000	991	$ (14,859)	98,197	162	85,491
Net income				3,488		3,488
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent					(448)	(448)
Purchase of treasury stock (in shares)			(3,546)
Purchase of treasury stock			$ (150)			(150)
Dividends declared				(2,639)		(2,639)
Balance (in shares) at Oct. 31, 2023	10,000,000		(573,017)
Balance at Oct. 31, 2023	$ 1,000	$ 991	$ (15,009)	$ 99,046	$ (286)	$ 85,742