Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Common stock	Additional paid-in capital	Treasury Stock	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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				37,782		37,782
Change in unrealized gains on securities, net of taxes					65	65
Purchase of treasury stock			(90)			(90)
Purchase of treasury stock (in shares)			(6,719)			(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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				6,925		6,925
Change in unrealized gains on securities, net of taxes					22	22
Purchase of treasury stock			(946)			(946)
Purchase of treasury stock (in shares)			(78,500)			(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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				6,619		6,619
Change in unrealized gains on securities, net of taxes					166	166
Purchase of treasury stock			(182)			(182)	[1]
Purchase of treasury stock (in shares)			(19,953)			(19,953)	[1]
Dividends declared				(5,932)		(5,932)
Balance at Apr. 30, 2013	$ 1,000	$ 991	$ (1,572)	$ 32,315	$ 251	$ 32,985
Balance (in shares) at Apr. 30, 2013	10,000,000		(123,572)

[1] Were acquired during the new repurchase program authorized in September 2012.