Note 6 - Stock Based Compensation (Tables)

9 Months Ended

Sep. 27, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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

	Three months ended				Nine months ended
	September 27, 2014		September 28, 2013		September 27, 2014		September 28, 2013
Amortization of restricted stock units	$	871	$	1,557	$	3,887	$	4,824
Amortization of ESP Plan		-		120		85		390
Amortization of stock option awards		1		54		99		74
Total stock based compensation	$	872	$	1,731	$	4,071	$	5,288
By Financial Statement line item
Cost of sales	$	183	$	322	$	705	$	914
Research and development expenses		374		613		1,450		1,653
Selling and administrative expenses		315		796		1,916		2,792
Restructuring charge		-		-		-		(71	)

Schedule of Nonvested Share Activity [Table Text Block]

	Restricted Stock Units										Stock Options
	Time-based					Performance-based					Time-based					Performance-based
	Units			WA price/ unit		Units			WA price/ unit		Issuable upon exercise			WA exercise price		Issuable upon exercise			WA exercise price
Outstanding at January 1, 2013		1,430		$	4.63		-		$	-		2,328		$	5.01		167		$	3.24
Granted		2,949			2.12		560			2.02		13			2.26		-			-
Shares vested/options exercised		(1,539	)		3.34		-			-		(69	)		1.93		-			-
Forfeited/expired (1)		(144	)		3.75		(384	)		2.02		(355	)		4.25		(125	)		3.24
Balance at December 31, 2013		2,696		$	2.67		176		$	2.02		1,917		$	5.24		42		$	3.24
Granted		2,785			1.49		433			1.84		3			1.91		-			-
Shares vested/options exercised		(2,215	)		2.74		(37	)		1.99		(5	)		1.83		-			-
Forfeited/expired		(390	)		1.83		(10	)		1.84		(677	)		5.97		(42	)		3.24
Balance at September 27, 2014		2,876		$	1.59		562		$	1.89		1,238		$	4.85		-		$	-

Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]

	As of September 27, 2014
Unrecognized stock based compensation cost
Option plans	$	7
Restricted stock units	$	3,211
Weighted average remaining recognition period
Option plans (in years)		1.8
Restricted stock units (in years)		1.3

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

Range of exercise prices			Outstanding Options at September 27, 2014		Weighted average remaining contractual life		Weighted average exercise price		Exercisable at September 27, 2014		Weighted average exercise price
$1.23	-	$1.91		12		6.9	$	1.76		6	$	1.67
$1.93	-	$1.93		444		3.6	$	1.93		444	$	1.93
$2.00	-	$3.68		333		5.5	$	3.27		331	$	3.28
$4.15	-	$18.98		449		2.2	$	8.97		449	$	8.97

Schedule of Share-based Payment Award Stock Option Awards and Employee Stock Purchase Plan Valuation Assumptions [Table Text Block]

	Nine months ended
	September 27, 2014			September 28, 2013
Stock option awards:
Risk-free interest rate		1.7	%		0.8	%
Expected volatility		58	%		72	%
Average expected term (in years)		5.0			5.0
Expected dividend yield		0.0	%		0.0	%
Weighted average fair value of options granted	$	0.97		$	1.37
ESP Plan:
Risk-free interest rate		0.1	%		0.1	%
Expected volatility		68	%		61	%
Average expected term (in years)		1.0			1.0
Expected dividend yield		0.0	%		0.0	%
Weighted average fair value of purchase option	$	0.26		$	0.67