Note 2 - Stock Based Compensation (Details) - Options Outstanding and Options Exercisable (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Dec. 26, 2014
Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Price Range, Lower range	$ 0.44
Options Outstanding, Price Range, Upper range	$ 1.25
Options Outstanding, Shares (in Shares)	521
Options Outstanding, Weighted Average Exercise Price	$ 0.71
Options Outstanding, Weighted Average Remaining Life	6 years 9 months
Options Exercisable, Price Range, Lower range	$ 0.44
Options Exercisable, Price Range, Upper range	$ 1.25
Options Exercisable, Shares (in Shares)	463
Options Exercisable, Weighted Average Exercise Price	$ 0.69
Options Exercisable, Weighted Average Remaining Life	6 years 255 days
Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Price Range, Lower range	$ 1.26
Options Outstanding, Price Range, Upper range	$ 2.50
Options Outstanding, Shares (in Shares)	1,168
Options Outstanding, Weighted Average Exercise Price	$ 1.81
Options Outstanding, Weighted Average Remaining Life	2 years 302 days
Options Exercisable, Price Range, Lower range	$ 1.26
Options Exercisable, Price Range, Upper range	$ 2.50
Options Exercisable, Shares (in Shares)	1,168
Options Exercisable, Weighted Average Exercise Price	$ 1.81
Options Exercisable, Weighted Average Remaining Life	2 years 302 days
Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Price Range, Lower range	$ 2.51
Options Outstanding, Price Range, Upper range	$ 5.34
Options Outstanding, Shares (in Shares)	250
Options Outstanding, Weighted Average Exercise Price	$ 2.83
Options Outstanding, Weighted Average Remaining Life	244 days
Options Exercisable, Price Range, Lower range	$ 2.51
Options Exercisable, Price Range, Upper range	$ 5.34
Options Exercisable, Shares (in Shares)	250
Options Exercisable, Weighted Average Exercise Price	$ 2.83
Options Exercisable, Weighted Average Remaining Life	244 days