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

9 Months Ended

Feb. 25, 2018

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	February 25 , 2018		May 28, 2017
Raw materials	$	13,512	$	10,158
Work in progress		3,756		3,447
Finished goods		11,481		11,685
Total	$	28,749	$	25,290

Comprehensive Income (Loss) [Table Text Block]

	Unrealized Gains on Cash Flow Hedge
Accumulated OCI, net, as of May 28, 2017	$	432
Other comprehensive income before reclassifications, net of tax effect		483
Amounts reclassified from OCI		—
Accumulated OCI, net, as of February 25, 2018	$	915

Schedule of Effect of Significant Unobservable Inputs for Investment [Table Text Block]

	At February 25, 2018			At May 28, 2017
Revenue growth rates		6%			4%
Expense growth rates	5%	to	6%		4%
Income tax rates		15%			15%
Discount rates		12%			12%

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

	Impact on value of investment in Windset as of February 25, 2018
10% increase in revenue growth rates	$	9,400
10% increase in expense growth rates	$	(8,800	)
10% increase in income tax rates	$	(500	)
10% increase in discount rates	$	(4,200	)

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Fair Value at February 25, 2018							Fair Value at May 28, 2017
Assets (liabilities):	Level 1		Level 2		Level 3			Level 1		Level 2		Level 3
Interest rate swap (1)	$	—	$	1,467	$	—		$	—	$	688	$	—
Investment in non-public company		—		—		65,800			—		—		63,600
Contingent consideration liability (2)		—		—		(5,400	)		—		—		(5,900	)
Total	$	—	$	1,467	$	60,400		$	—	$	688	$	57,700

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

	Three Months Ended				Nine Months Ended
	February 25, 2018		February 26, 2017		February 25, 2018		February 26, 2017
Recorded upon shipment	$	141,575	$	125,765	$	373,486	$	339,917
Recorded upon acceptance in foreign port		4,414		7,276		25,982		56,316
Revenue from multiple element arrangements		1,528		2,624		5,230		5,892
Revenue from license fees, R&D contracts and royalties/profit sharing		1,806		903		4,439		2,702
Total	$	149,323	$	136,568	$	409,137	$	404,827