Note 19 - Deferred Tax Assets (Liabilities) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Feb. 28, 2015	May 31, 2016	May 31, 2015
Change Due to Acquisitions [Member]
Deferred tax assets:
Change in Valuation Allowance
Change in Valuation Allowance
Additions [Member]
Deferred tax assets:
Change in Valuation Allowance		1,070,000	8,381,000
Change in Valuation Allowance		(1,070,000)	(8,381,000)
Reductions [Member]
Deferred tax assets:
Change in Valuation Allowance		11,000	166,000
Change in Valuation Allowance		(11,000)	(166,000)
Intangibles		(240,966,000)	(244,319,000)
Unremitted Subsidiary earnings		(10,046,000)	(10,375,000)
Interest expense		(6,119,000)	(8,704,000)
Property and equipment		(4,901,000)	(3,157,000)
Transfer pricing			(342,000)
Prepaids		(489,000)	(744,000)
Net operating loss carry-forwards		18,207,000	18,508,000
Tax credit carry-forwards		17,085,000	15,352,000
Compensation expense		6,801,000	5,186,000
Capitalized research		4,692,000	5,431,000
Inventory		3,763,000	1,939,000
Reserves not currently deductible		2,064,000	1,726,000
Other		788,000	1,062,000
Net deferred tax liabilities before valuation		(209,121,000)	(218,437,000)
Valuation Allowance		13,236,000	12,177,000
Net deferred tax liabilities		(222,357,000)	(230,614,000)
Balance, beginning of period		12,177,000	3,962,000
Change in Valuation Allowance	$ 7,600,000
Change in Valuation Allowance	$ (7,600,000)
Balance, end of period		$ 13,236,000	$ 12,177,000