CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital Contributions [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]
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 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
Issuance of restricted common stock	15	$ 0	15	0	0	0
Issuance of restricted common stock (in shares)		3
Net income (loss)	(10,224)	$ 0	0	(10,224)	0	0
Other comprehensive loss	(268)	0	0	0	(268)	0
Balance at Apr. 30, 2016	$ 82,844	$ 828	$ 50,553	$ 46,779	$ (11,101)	$ (4,215)
Balance (in shares) at Apr. 30, 2016		8,285