Note 16 - Segment and Geographic Information (Details) - Long-lived Assets by Geographic Area - USD ($) $ in Thousands		Aug. 31, 2015	May. 31, 2015
Long-lived assets (excluding goodwill and intangibles) by geography:
Non-current Assets		$ 73,340	$ 73,574
Concentration of net assets by geography:
Assets net		377,436	383,681
UNITED STATES
Long-lived assets (excluding goodwill and intangibles) by geography:
Non-current Assets		52,737	52,764
Concentration of net assets by geography:
Assets net		233,419	241,522
Europe [Member]
Long-lived assets (excluding goodwill and intangibles) by geography:
Non-current Assets	[1]	14,527	14,542
Concentration of net assets by geography:
Assets net		103,265	100,071
CANADA
Long-lived assets (excluding goodwill and intangibles) by geography:
Non-current Assets		3,700	4,029
Concentration of net assets by geography:
Assets net		28,808	30,274
Other Geographic Area [Member]
Long-lived assets (excluding goodwill and intangibles) by geography:
Non-current Assets	[2]	2,376	2,239
Concentration of net assets by geography:
Assets net	[2]	$ 11,944	$ 11,814

[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.