Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2014

Accounting Policies [Abstract]

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

	Three months ended						Six months ended
	June 30,						June 30,
	2014			2013			2014			2013
Basic and diluted loss per share:
Net loss	$	(622	)	$	(679	)	$	(4,692	)	$	(2,107	)
Basic and diluted loss per share:
Weighted average shares outstanding		7,836			4,623			6,512			4,547
Basic and diluted net loss per share	$	(0.08	)	$	(0.15	)	$	(0.72	)	$	(0.46	)

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

	Three months ended				Six months ended
	June 30,				June 30,
	2014		2013		2014		2013
Cost of sales	$	4	$	1	$	6	$	1
Research and development		3		8		2		15
Selling, general, and administrative		128		42		250		80
Total stock-based compensation	$	135	$	51	$	258	$	96

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Six months ended
	June 30,
	2014			2013
Fair value of options issued	$	3.34		$	1.58
Exercise price	$	4.34		$	2.32
Expected life of option		5.6			7.4
Risk-free interest rate		1.79	%		1.30	%
Expected volatility		98.1	%		89.2	%
Dividend yield		0	%		0	%

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)
Outstanding as of December 31, 2013		286,188		$	15.30
Granted		208,000			4.34
Exercised		(500	)		2.30
Cancelled/forfeited		(83,561	)		15.61
Outstanding as of June 30, 2014		410,127		$	9.70		7.6
Vested and expected to vest as of June 30, 2014		372,885		$	8.59		8.4
Exercisable as of June 30, 2014		207,818		$	14.83		7.2

Schedule of Product Warranty Liability [Table Text Block]

	Three months ended						Six months ended
	June 30,						June 30,
	2014			2013			2014			2013
Balance at the beginning of the period	$	75		$	140		$	75		$	159
Accruals for warranties issued		-			23			16			39
Settlements made during the period (in cash or in kind)		(7	)		(13	)		(23	)		(48	)
Balance at the end of the period	$	68		$	150		$	68		$	150