Note 5 - Fair Value (Tables)

6 Months Ended

Sep. 27, 2015

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	September 27, 2015
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	4	$	—	$	—	$	4
Common shares of CounterPath		—		43		—		43
Total investment assets	$	4	$	43	$	—	$	47

	March 29, 2015
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	6	$	—	$	—	$	6
Common shares of CounterPath		—		48		—		48
Total investment assets	$	6	$	48	$	—	$	54

Marketable Securities [Table Text Block]

	September 27, 2015		March 29, 2015
Cash and cash equivalents
Cash at financial institutions	$	53,480	$	55,227
Money market funds		4		6
Total cash and cash equivalents	$	53,484	$	55,233

Realized Gain (Loss) on Investments [Table Text Block]

	Three Months Ended				Six Months Ended
	September 27, 2015		September 28, 2014		September 27, 2015		September 28, 2014
Gross realized gains	$	—	$	—	$	—	$	264
Gross realized losses		—		—		—		(238	)
Net realized income (losses)	$	—	$	—	$	—	$	26