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				6,406		6,406
Change in unrealized gains on securities, net of taxes					181	181
Purchase of treasury stock (in shares)			(2,286)
Purchase of treasury stock			$ (46)			(46)
Dividends declared				(3,682)		(3,682)
Balance (in shares) at Oct. 31, 2018	10,000,000		(310,666)
Balance at Oct. 31, 2018	$ 1,000	991	$ (4,181)	47,626	964	46,400
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				7,901		7,901
Change in unrealized gains on securities, net of taxes					362	362
Purchase of treasury stock (in shares)			(16,493)
Purchase of treasury stock			$ (393)			(393)
Dividends declared				(3,863)		(3,863)
Balance (in shares) at Oct. 31, 2019	10,000,000		(352,932)
Balance at Oct. 31, 2019	$ 1,000	$ 991	$ (5,136)	$ 52,636	$ 2,040	$ 51,531