Note 16 - Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Nov. 30, 2015
May. 31, 2015
UNITED STATES    
Long-lived assets (excluding goodwill and intangibles) by geography:    
Non-current Assets $ 52,352 $ 52,764
Concentration of net assets by geography:    
Assets, net 222,590 241,522
Europe [Member]    
Long-lived assets (excluding goodwill and intangibles) by geography:    
Non-current Assets [1] 13,891 14,542
Concentration of net assets by geography:    
Assets, net 99,037 100,071
CANADA    
Long-lived assets (excluding goodwill and intangibles) by geography:    
Non-current Assets 3,613 4,029
Concentration of net assets by geography:    
Assets, net 28,738 30,274
Other Georgraphic Area [Member]    
Long-lived assets (excluding goodwill and intangibles) by geography:    
Non-current Assets [2] 2,370 2,239
Concentration of net assets by geography:    
Assets, net 11,746 11,814
Non-current Assets 72,226 73,574
Assets, net $ 362,111 $ 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.