Note 7 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

Year ended December 31,
(in thousands)	2014		2013
Current	$	26	$	43
Provision for uncertain tax positions		27		26
Total	$	53	$	69

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

Year ended December 31,	2014			2013
Statutory rate		35	%		35	%
Change in valuation allowance		(34	%)		(35	%)
Other – state		4	%		13	%
Effective rate		5	%		13	%

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

(in thousands)	2014			2013
Deferred tax assets:
Federal, state and foreign loss carryforwards	$	7,039		$	6,527
Capitalized research and development		241			475
Deferred revenue		71			77
Federal and state tax credits		2,269			1,762
Other		503			563
Total deferred tax asset		10,123			9,404
Less valuation allowance		(10,123	)		(9,404	)
Net deferred tax asset	$	--		$	--

Summary of Operating Loss Carryforwards [Table Text Block]

(in thousands)	2014		2013
2019	$	2,901	$	2,901
2021		1,184		1,184
2022		1,083		1,083
2023		1,302		1,302
Thereafter		13,642		12,177
Total	$	20,112	$	18,647