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

9 Months Ended

Sep. 30, 2014

Accounting Policies [Abstract]

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

	Three months ended						Nine months ended
	September 30,						September 30,
	2014			2013			2014			2013
Basic and diluted loss per share:
Net loss	$	(403	)	$	(1,651	)	$	(5,095	)	$	(3,758	)
Basic and diluted loss per share:
Weighted average shares outstanding		8,781			4,916			7,276			4,671
Basic and diluted net loss per share	$	(0.05	)	$	(0.34	)	$	(0.70	)	$	(0.80	)

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

	Three months ended				Nine months ended
	September 30,				September 30,
	2014		2013		2014		2013
Cost of sales	$	4	$	1	$	10	$	2
Research and development		3		11		5		26
Selling, general, and administrative		145		41		395		121
Total stock-based compensation	$	152	$	53	$	410	$	149

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

	Nine months ended
	September 30,
	2014			2013
Fair value of options issued	$	3.44		$	1.72
Exercise price	$	4.48		$	2.47
Expected life of option (in years)		5.6			7.2
Risk-free interest rate		1.79	%		1.32	%
Expected volatility		97.93	%		90.24	%
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		278,000			4.58
Exercised		(3,000	)		2.30
Cancelled/forfeited		(94,632	)		14.32
Outstanding as of September 30, 2014		466,556		$	9.19		8.2
Vested and expected to vest as of September 30, 2014		429,781		$	8.18		8.2
Exercisable as of September 30, 2014		244,648		$	13.32		7.3

Schedule of Product Warranty Liability [Table Text Block]

	Three months ended						Nine months ended
	September 30,						September 30,
	2014			2013			2014			2013
Balance at the beginning of the period	$	68		$	150		$	75		$	159
Accruals for warranties issued		32			7			48			46
Settlements made during the period (in cash or in kind)		(24	)		(17	)		(47	)		(65	)
Balance at the end of the period	$	76		$	140		$	76		$	140