Note 16 - Segment and Geographic Information (Details) - Long-Lived Assets by Geographic Area (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015		May 31, 2014
Long-lived assets (excluding goodwill and intangibles) by geography:
Long-lived Assets	$ 73,243		$ 76,311
Concentration of Net Assets	389,054		468,616
UNITED STATES
Long-lived assets (excluding goodwill and intangibles) by geography:
Long-lived Assets	52,856		54,066
Concentration of Net Assets	245,731		299,948
Europe [Member]
Long-lived assets (excluding goodwill and intangibles) by geography:
Long-lived Assets	14,003	[1]	15,725	[1]
Concentration of Net Assets	102,885		123,095
CANADA
Long-lived assets (excluding goodwill and intangibles) by geography:
Long-lived Assets	4,074		4,517
Concentration of Net Assets	28,535		32,802
Other Geographic Area [Member]
Long-lived assets (excluding goodwill and intangibles) by geography:
Long-lived Assets	2,310	[2]	2,003	[2]
Concentration of Net Assets	$ 11,903	[2]	$ 12,771	[2]

[1] Long-lived assets located in any individual country within Europe were not material to the Company's consolidated long-lived assets.

[2] Primarily Japan and India.