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, 2015	10,000,000		(190,504)
Balance at Apr. 30, 2015	$ 1,000	$ 991	$ (2,244)	$ 34,587	$ 105	$ 34,439
Net income				6,024		6,024
Change in unrealized gains on securities, net of taxes					(153)	(153)
Purchase of treasury stock (in shares)			(41,453)
Purchase of treasury stock			$ (609)			(609)
Dividends declared				(4,694)		(4,694)
Balance (in shares) at Jan. 31, 2016	10,000,000		(231,957)
Balance at Jan. 31, 2016	$ 1,000	991	$ (2,853)	35,917	(48)	35,007
Treasury Stock, Value, Acquired, Cost Method			609			609
Purchase of treasury stock			$ (609)			(609)
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
Treasury Stock, Value, Acquired, Cost Method			681			681
Purchase of treasury stock			$ (681)			$ (681)