Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies (Details) - Stock-based Compensation Expense (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 25, 2014	May 26, 2013	May 27, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 1,356	$ 1,695	$ 1,872
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	39	718	530
Sales, General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	1,317	977	1,342
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	558	788	1,046
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 798	$ 907	$ 826