Note 1 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 26, 2016

Notes Tables

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Three Months Ended
	March 26,			March 28,
	2016			2015
Cost of sales	$	(66	)	$	115
Research and development		416			331
Selling, general and administrative		1,607			1,252
Total share-based compensation		1,957			1,698
Income tax benefit		(40	)		(44	)
Total share-based compensation, net	$	1,917		$	1,654

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended
	March 26,		March 28,
	2016		2015
Weighted average common shares		26,317		25,751
Effect of dilutive stock options		-		-
		26,317		25,751

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

	Three Months Ended
	March 26,			March 28,
	2016			2015
Customers individually accounting for more than 10% of net sales		2			3
Percentage of net sales		32	%		47	%