Consolidated Condensed Statement of Changes in Shareholders' Equity (unaudited) - USD ($) $ in Thousands	Common stock	Additional paid-in capital	Treasury Stock	Retained earnings	Accumulated Other Comprehensive income/(loss)	Total
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				6,195		6,195
Change in unrealized gains on securities, net of taxes					(33)	(33)
Purchase of treasury stock			$ (71)			(71)
Purchase of treasury stock (in shares)			(5,061)
Dividends declared				(4,416)		(4,416)
Balance at Jan. 31, 2015	$ 1,000	991	$ (2,193)	34,962	213	34,973
Balance (in shares) at Jan. 31, 2015	10,000,000		(187,132)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				6,024		6,024
Change in unrealized gains on securities, net of taxes					(153)	(153)
Purchase of treasury stock			$ (609)			(609)
Purchase of treasury stock (in shares)			(41,453)
Dividends declared				(4,694)		(4,694)
Balance at Jan. 31, 2016	$ 1,000	$ 991	$ (2,853)	$ 35,917	$ (48)	$ 35,007
Balance (in shares) at Jan. 31, 2016	10,000,000		(231,957)