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Note 6 - Stock-Based Compensation (Tables)

9 Months Ended

Feb. 23, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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

		Three Months Ended February 23, 2014				Three Months Ended February 24, 2013				Nine Months Ended February 23, 2014				Nine Months Ended February 24, 2013
Research and development		$	14,000			$	251,000			$	28,000			$	465,000
Sales, general and administrative		$	339,000			$	213,000			$	964,000			$	670,000
Total stock-based compensation		$	353,000			$	464,000			$	992,000			$	1,135,000