Note 8 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

	Year Ended December 31,
	2020			2019
U.S.	$	(851	)	$	(8,225	)
Foreign		(1,038	)		(940	)
Total	$	(1,889	)	$	(9,165	)

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

	Year Ended December 31,
	2020		2019
Current taxes:
Federal	$	-	$	-
State and local		-		16
Foreign		-		-
Current taxes		-		16
Deferred taxes:
Federal		-		-
State and local		-		-
Foreign		-		-
Deferred taxes		-		-
Total	$	-	$	16

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

	December 31,
	2020			2019
Deferred tax assets:
Net operating loss carryforwards	$	18,141		$	18,677
Research and development credit carryforwards		3,058			3,576
Share-based compensation		449			645
Accrued expenses and reserves		137			127
Depreciation and amortization		38			17
Deferred revenue		253			275
Right of use liability		357			301
Other		23			14
Gross deferred tax assets		22,456			23,632
Less: valuation allowance		(22,121	)		(23,324	)
Net deferred tax assets		335			308
Deferred tax liabilities:
Right of use asset		(328	)		(301	)
Net deferred tax assets	$	7		$	7

	December 31,
	2020		2019
Deferred tax assets, non-current	$	7	$	7
Deferred tax liability, non-current		-		-
Net deferred tax assets	$	7	$	7

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

	Year Ended December 31,
	2020					2019
U.S. Federal tax benefit at statutory rates	$	(397	)	21.0	%	$	(1,925	)	21.0	%
Impact of:
Tax credits		109		(5.8	)		(715	)	7.8
State income tax		(53	)	2.8			(108	)	1.2
International operations		(6	)	0.3			409		(4.5	)
Share-based compensation		317		(16.8	)		348		(3.8	)
Valuation allowance		(1,224	)	64.8			1,471		(16.0	)
Expiration of tax attributes		1,330		(70.4	)		475		(5.2	)
Other, net		(76	)	4.0			61		(0.7	)
Tax expense and effective tax rate	$	—		0.0	%	$	16		(0.2	)%