Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Tables)

6 Months Ended

Nov. 29, 2015

Notes Tables

Schedule of Effect of Significant Unobservable Inputs for Investment [TableText Block]

	At November 29, 2015				At May 31, 2015
Revenue growth rates			4%				4%
Expense growth rates			4%				4%
Income tax rates			15%				15%
Discount rates		15%	to	21%		15%	to	21%

Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block]

Impact on value of Windset investment as of November 29, 2015
10% increase in revenue growth rates	$	2,200
10% increase in expense growth rates	$	(1,800	)
10% increase in income tax rates	$	—
10% increase in discount rates	$	(1,000	)

Revenue Recognition, Multiple-deliverable Arrangements [Table Text Block]

	Three months ended November 29, 2015		Three months ended November 30 , 201 4		Six months ended November 29 , 201 5		Six months ended November 30 , 201 4
Recorded upon shipment	$	112,709	$	109,764	$	223,125	$	216,004
Recorded upon acceptance in foreign port		22,140		22,106		44,484		48,693
Revenue from license fees, R&D contracts and royalties/profit sharing		1,534		423		2,540		635
Revenue from multiple element arrangements		4,058		372		5,647		947
Total	$	140,441	$	132,665	$	275,796	$	266,279