Note 21 - Supplementary Quarterly Financial Data (Unaudited) (Details) - Unaudited Quarterly Financial Data (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 29, 2015	Dec. 28, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 29, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 29, 2015	Mar. 30, 2014	Mar. 31, 2013
Net sales by end market:
Net sales	$ 43,857	$ 44,315	$ 43,159	$ 30,719	$ 27,987	$ 30,690	$ 34,018	$ 32,627	$ 125,791	$ 89,595	$ 85,856
Gross profit	17,948	16,890	4,132	10,956	8,422	12,826	13,929	15,477	49,926	50,654	55,687
Income (loss) from operations	(2,346)	(6,535)	(22,830)	(11,352)	(311)	(3,321)	(616)	547	(43,063)	(3,701)	(583)
Net income (loss)	(2,914)	(6,599)	(23,352)	(12,105)	147	(1,634)	6,482	806	(44,970)	5,801	2,882
Net income (loss) per share to common stockholders:
Basic (in Dollars per share)	$ (0.06)	$ (0.14)	$ (0.50)	$ (0.26)	$ 0.00	$ (0.03)	$ 0.14	$ 0.02	$ (0.95)	$ 0.12	$ 0.06
Diluted (in Dollars per share)	$ (0.06)	$ (0.14)	$ (0.50)	$ (0.26)	$ 0.00	$ (0.03)	$ 0.13	$ 0.02	$ (0.95)	$ 0.12	$ 0.06
Shares used in the computation of net income (loss) per share:
Basic (in Shares)	47,516	47,119	47,139	47,236	47,328	47,529	47,496	46,805
Diluted (in Shares)	47,516	47,119	47,139	47,236	48,778	47,529	49,150	48,085	47,253,000	48,823,000	46,476,000
Industrial And Embedded Systems [Member]
Net sales by end market:
Net sales	20,021	20,506	19,656	18,867	19,588	18,429	17,943	16,498
High End Consumer [Member]
Net sales by end market:
Net sales	16,072	16,202	16,199	3,424	43	68	105	246
Infrastructure [Member]
Net sales by end market:
Net sales	$ 7,764	$ 7,607	$ 7,304	$ 8,428	$ 8,356	$ 12,193	$ 15,970	$ 15,883