CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Capital Contributions [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Balance at Apr. 30, 2013	$ 72,541	$ 742	$ 46,100	$ 63,920	$ (11,564)	$ (26,657)
Balance (in shares) at Apr. 30, 2013		7,421
Issuance of common stock from treasury shares	7,144	$ 0	0	(15,298)	0	22,442
Issuance of restricted common stock	166	$ 2	164	0	0	0
Issuance of restricted common stock (in shares)		24
Net income (loss)	(2,939)	$ 0	0	(2,939)	0	0
Other comprehensive income (loss)	2,389	0	0	0	2,389	0
Balance at Apr. 30, 2014	79,301	$ 744	46,264	45,683	(9,175)	(4,215)
Balance(in shares) at Apr. 30, 2014		7,445
Issuance of common stock related to settlement	4,274	$ 83	4,191	0	0	0
Issuance of common stock related to settlement (in shares)		825
Issuance of restricted common stock	84	$ 1	83	0	0	0
Issuance of restricted common stock (in shares)		12
Net income (loss)	11,320	$ 0	0	11,320	0	0
Other comprehensive income (loss)	(1,658)	0	0	0	(1,658)	0
Balance at Apr. 30, 2015	$ 93,321	$ 828	$ 50,538	$ 57,003	$ (10,833)	$ (4,215)
Balance(in shares) at Apr. 30, 2015		8,282