Note 2 - Stock Based Compensation (Details) - Summary of Stock-based Compensation Expense (USD $)	3 Months Ended		9 Months Ended
	Dec. 26, 2014	Dec. 27, 2013	Dec. 26, 2014	Dec. 27, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock based compensation expense	$ 15,000	$ 40,000	$ 52,000	$ 110,000
Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock based compensation expense	1,000	1,000	4,000	5,000
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock based compensation expense	3,000	4,000	10,000	16,000
General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock based compensation expense	10,000	31,000	33,000	70,000
Selling and Marketing Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock based compensation expense	$ 1,000	$ 4,000	$ 5,000	$ 19,000