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, 2016	10,000,000		(243,411)
Balance at Apr. 30, 2016	$ 1,000	$ 991	$ (3,040)	$ 35,524	$ 125	$ 34,600
Net income				9,283		9,283
Change in unrealized gains on securities, net of taxes					150	150
Purchase of treasury stock (in shares)			(41,461)
Purchase of treasury stock			$ (681)			(681)
Dividends declared				(4,957)		(4,957)
Balance (in shares) at Jan. 31, 2017	10,000,000		(284,872)
Balance at Jan. 31, 2017	$ 1,000	991	$ (3,721)	39,850	275	38,395
Balance (in shares) at Apr. 30, 2017	10,000,000		(288,335)
Balance at Apr. 30, 2017	$ 1,000	991	$ (3,781)	39,186	458	37,854
Net income				13,283		13,283
Change in unrealized gains on securities, net of taxes					753	753
Purchase of treasury stock (in shares)			(11,150)
Purchase of treasury stock			$ (191)			(191)
Dividends declared				(7,181)		(7,181)
Balance (in shares) at Jan. 31, 2018	10,000,000		(299,485)
Balance at Jan. 31, 2018	$ 1,000	$ 991	$ (3,972)	$ 45,288	$ 1,211	$ 44,518