Note 21 - Supplementary Quarterly Financial Data (Unaudited) (Details) - Selected Unaudited Quarterly Financial Data (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 30, 2014	Dec. 29, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 30, 2012	Sep. 30, 2012	Jul. 01, 2012	Mar. 30, 2014	Mar. 31, 2013	Apr. 01, 2012
Net sales by end market:
Sales Revenue Net	$ 27,987,000	$ 30,690,000	$ 34,018,000	$ 32,627,000	$ 31,154,000	$ 30,999,000	$ 30,622,000	$ 29,251,000	$ 89,595,000	$ 85,856,000	$ 89,988,000
Gross profit	8,422,000	12,826,000	13,929,000	15,477,000	15,296,000	14,192,000	13,330,000	12,869,000	50,654,000	55,687,000	55,924,000
Income (loss) from operations	(311,000)	(3,321,000)	(616,000)	547,000	1,309,000	(353,000)	(373,000)	(1,166,000)	(3,701,000)	(583,000)	(30,593,000)
Net income (loss)	147,000	(1,634,000)	6,482,000	806,000	1,672,000	1,523,000	263,000	(576,000)	5,801,000	2,882,000	(28,056,000)
Net income (loss) per share:
Basic (in Dollars per share)	$ 0.00	$ (0.03)	$ 0.14	$ 0.02	$ 0.04	$ 0.03	$ 0.01	$ (0.01)	$ 0.12	$ 0.06	$ (0.63)
Diluted (in Dollars per share)	$ 0.00	$ (0.03)	$ 0.13	$ 0.02	$ 0.04	$ 0.03	$ 0.01	$ (0.01)	$ 0.12	$ 0.06	$ (0.63)
Shares used in the computation of net income (loss) per share:
Basic (in Shares)	47,328	47,529	47,496	46,805	46,219	45,925	45,720	45,388
Diluted (in Shares)	48,778	47,529	49,150	48,085	47,379	46,438	46,046	45,388	48,823	46,476	44,796
Industrial And Embedded Systems [Member]
Net sales by end market:
Sales Revenue Net	19,588,000	18,429,000	17,943,000	16,498,000	15,265,000	16,119,000	15,923,000	16,088,000
Networking And Storage [Member]
Net sales by end market:
Sales Revenue Net	3,310,000	7,104,000	10,273,000	9,907,000	9,346,000	9,300,000	7,656,000	6,435,000
Communications Infrastructure [Member]
Net sales by end market:
Sales Revenue Net	5,046,000	5,089,000	5,697,000	5,976,000	6,231,000	5,270,000	6,737,000	6,728,000
Other Segments [Member]
Net sales by end market:
Sales Revenue Net	$ 43,000	$ 68,000	$ 105,000	$ 246,000	$ 312,000	$ 310,000	$ 306,000