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

12 Months Ended

May 26, 2013

Accounting Policies [Abstract]

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

		Balance at beginning of period				Additions from acquisitions and additions from charges to costs and expenses				Write offs net of recoveries				Balance at end of period
Year ended May 29, 2011		$	189			$	209			$	(56	)		$	342
Year ended May 27, 2012		$	342			$	248			$	(78	)		$	512
Year ended May 26, 2013		$	512			$	109			$	(38	)		$	583

Schedule of Inventory, Current [Table Text Block]

		May 26, 2013				May 27, 2012
Finished goods		$	11,297			$	9,406
Raw materials			9,290				9,876
Work in progress			3,526				2,729
Inventories, net		$	24,113			$	22,011

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

		Fiscal Year Ended May 26, 2013				Fiscal Year Ended May 27, 2012				Fiscal Year Ended May 29, 2011
Numerator:
Net income applicable to Common Stockholders		$	22,587			$	12,696			$	3,920
Denominator:
Weighted average shares for basic net income per share			25,830				25,849				26,397
Effect of dilutive securities:
Stock options and restricted stock units			796				277				229
Weighted average shares for diluted net income per share			26,626				26,126				26,626
Diluted net income per share		$	0.85			$	0.49			$	0.15

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

		Fiscal Year Ended May 26, 2013				Fiscal Year Ended May 27, 2012				Fiscal Year Ended May 29, 2011
Research and development		$	718,000			$	530,000			$	565,000
Sales, general and administrative			977,000				1,342,000				1,386,000
Total stock-based compensation expense		$	1,695,000			$	1,872,000			$	1,951,000

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

		Fiscal Year Ended May 26, 2013				Fiscal Year Ended May 27, 2012				Fiscal Year Ended May 29, 2011
Expected life (in years)			3.76				3.76				3.76
Risk-free interest rate			0.48%				0.59%				1.16%
Volatility			0.53				0.53				0.52
Dividend yield			0%				0%				0%

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

	At May 26, 2013			At May 27, 2012
Revenue growth rates	3%	to	9%	3%	to	24%
Expense growth rates	3%	to	8%	3%	to	18%
Income tax rates		15%			25%
Discount rates	18%	to	28%	14%	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 May 26, 2013
10% increase in revenue growth rates	$1,700
10% increase in expense growth rates	($1,400)
10% increase in income tax rates	($100)
10% increase in discount rates	($900)

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

		Fair Value at May 26, 2013												Fair Value at May 27, 2012
		Level 1				Level 2				Level 3				Level 1				Level 2				Level 3
Assets:
Marketable securities		$	1,545			$	-			$	-			$	-			$	-			$	-
Investment in private company			-				-				29,600				-				-				21,500
Total		$	1,545			$	-			$	29,600			$	-			$	-			$	21,500
Liabilities:
Contingent consideration		$	-			$	-			$	-			$	-			$	-			$	3,933
Interest rate swap			-				163				-				-				347				-
Total		$	-			$	163			$	-			$	-			$	347			$	3,933

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