Note 6 - Stock Based Compensation (Tables)

6 Months Ended

Jul. 04, 2015

Notes Tables

Schedule of Nonvested Share Activity [Table Text Block]

	Restricted Stock Units										Stock Options
	Time-based					Performance-based					Time-based
	Units			Weighted Average (WA) grant date fair value		Units			WA price/ unit		Issuable upon exercise			WA exercise price		WA remaining contractual life (years)
Outstanding at January 1, 201 5		2,790		$	1.58		314		$	1.87		1,219		$	4.82
Granted		2,462			1.04		264			1.05		11			1.18
Shares vested/options exercised		(1,440	)		1.37		(10	)		2.03		-			-
Forfeited/expired		(141	)		1.25		-			-		(131	)		4.68
Outstanding at July 4, 2015		3,671		$	1.31		568		$	1.56		1,099		$	4.80	3.2
Exercisable at July 4, 2015	N/A			N/A		N/A			N/A			1,084		$	4.85	3.2

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

	Three months ended				Six months ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
Cost of sales	$	266	$	246	$	540	$	522
Research and development expenses		472		522		925		1,076
Selling and administrative expenses		388		588		857		1,601
Total stock based compensation	$	1,126	$	1,356	$	2,322	$	3,199

Schedule Of Share Based Payment Award Stock Option Awards And Employee Stock Purchase Plan Valuation Assumptions [Table Text Block]

	Six months ended
	July 4, 2015			June 28, 2014
Stock option awards:
Risk-free interest rate		1.3	%		1.7	%
Expected volatility		63	%		58	%
Average expected term (in years)		5.0			5.0
Expected dividend yield		0.0	%		0.0	%
Weighted average fair value of options granted	$	0.63		$	0.97
ESP Plan:
Risk-free interest rate		0.3	%		0.1	%
Expected volatility		77	%		57	%
Average expected term (in years)		1.0			1.0
Expected dividend yield		0.0	%		0.0	%
Weighted average fair value of purchase option	$	0.31		$	0.28
Performance awards:
Average risk-free interest rate		0.6	%		0.3	%
Expected volatility		66.5	%		54.6	%
Average expected term (in years)		3.0			3.0
Expected dividend yield		0.0	%		0.0	%
Weighted average fair value of performance awards	$	1.05		$	1.84