Note 7 - Goodwill (Tables)

3 Months Ended

Aug. 31, 2015

Disclosure Text Block Supplement [Abstract]

Schedule of Goodwill [Table Text Block]

	August 31, 2015			May 31, 2015
Balance at beginning of period	$	842,258			851,563
Additions:
Acquisition of businesses		346			432
Foreign currency translation adjustment		(294	)		(9,737	)
Balance at end of period	$	842,310			842,258