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

12 Months Ended

May. 31, 2015

Notes Tables

Allowance for Credit Losses on Financing Receivables [Table Text Block]

		Balance at beginning of period				Additions from acquisitions and adjustments charged to revenue and expenses				Write offs, net of recoveries				Balance at end of period
Year ended May 26, 2013		$	512			$	109			$	(38	)		$	583
Year ended May 25, 2014		$	583			$	143			$	(210	)		$	516
Year ended May 31, 2015		$	516			$	—			$	(134	)		$	382

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

		Year ended May 31 , 201 5				Year ended May 25 , 201 4				Year ended May 26 , 201 3
Recorded upon shipment		$	465,484			$	398,938			$	359,518
Recorded upon acceptance in foreign port			67,714				69,710				78,442
Revenue from multiple element arrangements			4,253				6,811				1,773
Revenue from license fees, R&D contracts and royalties/profit sharing			1,806				1,354				1,975
Total		$	539,257			$	476,813			$	441,708

Schedule of Inventory, Current [Table Text Block]

		May 31, 2015				May 25, 2014
Finished goods		$	13,271			$	11,111
Raw materials			9,879				10,376
Work in progress			1,877				3,248
Inventories, net		$	25,027			$	24,735

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

		Fiscal Year Ended May 31, 2015				Fiscal Year Ended May 25, 2014				Fiscal Year Ended May 26, 2013
Numerator:
Net income applicable to Common Stockholders		$	13,544			$	19,145			$	22,587
Denominator:
Weighted average shares for basic net income per share			26,884				26,628				25,830
Effect of dilutive securities:
Stock options and restricted stock units			452				492				796
Weighted average shares for diluted net income per share			27,336				27,120				26,626
Diluted net income per share		$	0.50			$	0.71			$	0.85

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

		Fiscal Year Ended May 31, 2015				Fiscal Year Ended May 25, 2014				Fiscal Year Ended May 26, 2013
Options		$	561			$	558			$	788
RSUs			1,016				798				907
Total stock-based compensation expense		$	1,577			$	1,356			$	1,695

		Fiscal Year Ended May 31, 2015				Fiscal Year Ended May 25, 2014				Fiscal Year Ended May 26, 2013
Research and development		$	38			$	39			$	718
Sales, general and administrative			1,539				1,317				977
Total stock-based compensation expense		$	1,577			$	1,356			$	1,695

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		Fiscal Year Ended May 31, 2015				Fiscal Year Ended May 25, 2014				Fiscal Year Ended May 26, 2013
Expected life (in years)			3.25				3.50				3.76
Risk-free interest rate			1.00	%			0.71	%			0.48	%
Volatility			0.32				0.41				0.53
Dividend yield			0	%			0	%			0	%

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

		At May 31, 2015				At May 25, 2014
Annual consolidated revenue growth rates			4	%			4	%
Annual consolidated expense growth rates			4	%			4	%
Consolidated income tax rates			15	%			15	%
Consolidated discount rates			15% to 21	%			16% to 22	%

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 May 31, 2015
10% increase in revenue growth rates		$	2,300
10% increase in expense growth rates		$	(1,200	)
10% increase in income tax rates		$	(100	)
10% increase in discount rates		$	(1,500	)

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

		Fair Value at May 31, 2015												Fair Value at May 25, 2014
Assets:		Level 1				Level 2				Level 3				Level 1				Level 2				Level 3
Marketable securities		$	-			$	-			$	-			$	-			$	-			$	-
Investment in private company			-				-				61,500				-				-				39,600
Total		$	-			$	-			$	61,500			$	-			$	-			$	39,600
Liabilities:
Interest rate swap			-				-				-				-				44				-
Total		$	-			$	-			$	-			$	-			$	44			$	-

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