Note 12 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended
	December 31,
	2014			2013
Income tax provision (benefit) at statutory rate		(34	)%		(34	)%
State income taxes, net of federal benefit		(6	)%		(6	)%
Merger transaction costs		6	%		-
Change in valuation allowance		37	%		39	%
Other		(3	)%		1	%
Effective tax rate		0	%		0	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 31,
	2014			2013
Deferred tax assets:
Net operating loss carryforwards	$	5,770		$	4,203
Capitalized start up costs		7,751			7,156
Research and development credits		189			162
Accruals and reserves		169			99
Total deferred tax assets		13,879			11,620
Deferred tax liabilities:
Depreciation and amortization		(13	)		(11	)
Valuation allowance		(13,866	)		(11,609	)
Net deferred tax assets	$	-		$	-

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

	Year Ended
	December 31,
	2014		2013
Balance as of the beginning of the year	$	83	$	83
Additions based upon tax positions related to the current year		14		-
Balance as of the end of the year	$	97	$	83