Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Common stock	Additional paid-in capital	Treasury Stock	Retained earnings	Accumulated Other Comprehensive income (loss)	Total
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				6,768		6,768
Change in unrealized gains on securities, net of taxes					(5)	(5)
Purchase of treasury stock			$ (550)			$ (550)	[1]
Purchase of treasury stock (in shares)			(58,499)			(58,499)	[1]
Dividends declared				(5,900)		$ (5,900)
Balance at Apr. 30, 2014	$ 1,000	991	$ (2,122)	33,183	246	33,298
Balance (in shares) at Apr. 30, 2014	10,000,000		(182,071)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				7,292		7,292
Change in unrealized gains on securities, net of taxes					(141)	(141)
Purchase of treasury stock			$ (122)			$ (122)	[1]
Purchase of treasury stock (in shares)			(8,433)			(8,433)	[1]
Dividends declared				(5,888)		$ (5,888)
Balance at Apr. 30, 2015	$ 1,000	$ 991	$ (2,244)	$ 34,587	$ 105	$ 34,439
Balance (in shares) at Apr. 30, 2015	10,000,000		(190,504)

[1] Were acquired during the $3 million repurchase program authorized in September 2012.