Consolidated Condensed Statement of Changes in Shareholders' Equity (unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Common stock	Additional paid-in capital	Treasury Stock	Comprehensive income/(loss)	Retained earnings	Accumulated Other Comprehensive income/(loss)	Total
Balance at Apr. 30, 2010	$ 1,000	$ 991	$ (354)		$ 19,813	$ (2)	$ 21,448
Balance (in shares) at Apr. 30, 2010	10,000,000		(18,400)
Comprehensive income
Net income				34,841	34,841		34,841
Other comprehensive income, net of tax:
Change in unrealized gains on securities, net of taxes				10		10	10
Comprehensive income				34,851
Purchase of treasury stock			(57)				(57)
Purchase of treasury stock (in shares)			(4,298)
Dividends declared					(23,956)		(23,956)
Balance at Jan. 31, 2011	1,000	991	(411)		30,698	8	32,286
Balance (in shares) at Jan. 31, 2011	10,000,000		(22,698)
Balance at Apr. 30, 2011	1,000	991	(444)		31,644	63	33,254
Balance (in shares) at Apr. 30, 2011	10,000,000		(25,119)
Comprehensive income
Net income				5,835	5,835		5,835
Other comprehensive income, net of tax:
Change in unrealized gains on securities, net of taxes				13		13	13
Comprehensive income				5,848
Purchase of treasury stock			(946)				(946)
Purchase of treasury stock (in shares)			(78,500)
Dividends declared					(5,457)		(5,457)
Balance at Jan. 31, 2012	$ 1,000	$ 991	$ (1,390)		$ 32,022	$ 76	$ 32,699
Balance (in shares) at Jan. 31, 2012	10,000,000		(103,619)