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	Retained earnings	Accumulated Other Comprehensive income/(loss)	Total
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				5,835		5,835
Change in unrealized gains on securities, net of taxes					13	13
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)
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				5,095		5,095
Change in unrealized gains on securities, net of taxes					46	46
Purchase of treasury stock			(147)			(147)
Purchase of treasury stock (in shares)			(16,330)
Dividends declared				(4,451)		(4,451)
Balance at Jan. 31, 2013	$ 1,000	$ 991	$ (1,537)	$ 32,272	$ 131	$ 32,857
Balance (in shares) at Jan. 31, 2013	10,000,000		(119,949)