Consolidated Statements of Changes in Shareholders' Equity (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, 2009	$ 1,000	$ 991	$ (354)		$ 78,935	$ 297	$ 80,869
Balance (in shares) at Apr. 30, 2009	10,000,000		(18,400)
Comprehensive income
Net income (loss)				(23,188)	(23,188)		(23,188)
Other comprehensive income, net of tax:
Change in unrealized losses on securities, net of taxes				(299)		(299)	(299)
Comprehensive income				(23,487)
Dividends declared					(35,934)		(35,934)
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 (loss)				37,782	37,782		37,782
Other comprehensive income, net of tax:
Change in unrealized losses on securities, net of taxes				65		65	65
Comprehensive income				37,847
Purchase of treasury stock			(90)				(90)
Purchase of treasury stock (in shares)			(6,719)
Dividends declared					(25,951)		(25,951)
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 (loss)				6,925	6,925		6,925
Other comprehensive income, net of tax:
Change in unrealized losses on securities, net of taxes				22		22	22
Comprehensive income				6,947
Purchase of treasury stock			(946)				(946)
Purchase of treasury stock (in shares)			(78,500)
Dividends declared					(6,941)		(6,941)
Balance at Apr. 30, 2012	$ 1,000	$ 991	$ (1,390)		$ 31,628	$ 85	$ 32,314
Balance (in shares) at Apr. 30, 2012	10,000,000		(103,619)