Note 19 - Segment and Geographic Information (Details) - Net Export Sales to Unaffiliated Customers (USD $) In Thousands, unless otherwise specified	3 Months Ended										9 Months Ended		12 Months Ended
	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	Aug. 19, 2011		May 31, 2012		May 31, 2014		May 31, 2013
Net sales to customers by geography are as follows:
Net sales to customers by geography	$ 100,830	$ 90,979	$ 100,203	$ 96,044	$ 94,386	$ 86,192	$ 82,056	$ 85,154	$ 74,910		$ 261,814		$ 388,056		$ 347,788
UNITED STATES
Net sales to customers by geography are as follows:
Net sales to customers by geography									50,988		173,918		239,204		229,944
Europe [Member]
Net sales to customers by geography are as follows:
Net sales to customers by geography									14,180	[1]	49,486	[1]	79,219	[1]	63,643	[1]
CANADA
Net sales to customers by geography are as follows:
Net sales to customers by geography									3,907		14,349		19,127		19,985
Other Geographic Area [Member]
Net sales to customers by geography are as follows:
Net sales to customers by geography									$ 5,835		$ 24,061		$ 50,506		$ 34,216

[1] Net sales to any individual country within Europe were not material to the Company's consolidated net sales.