Note 17 - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands		Feb. 29, 2016	May. 31, 2015
UNITED STATES
Long-lived assets (excluding goodwill and intangibles) by geography:
Non-current Assets		$ 52,806	$ 52,764
Concentration of net assets by geography:
Assets, net		218,636	241,522
Europe [Member]
Long-lived assets (excluding goodwill and intangibles) by geography:
Non-current Assets	[1]	14,059	14,542
Concentration of net assets by geography:
Assets, net		99,135	100,071
CANADA
Long-lived assets (excluding goodwill and intangibles) by geography:
Non-current Assets		3,483	4,029
Concentration of net assets by geography:
Assets, net		26,274	30,274
Other Georgraphic Area [Member]
Long-lived assets (excluding goodwill and intangibles) by geography:
Non-current Assets	[2]	2,440	2,239
Concentration of net assets by geography:
Assets, net		12,577	11,814
Non-current Assets		72,788	73,574
Assets, net		$ 356,622	$ 383,681

[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.