Note 8 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

	Year Ended December 31,
	2021			2020
U.S.	$	(820	)	$	(851	)
Foreign		(1,422	)		(1,038	)
Total	$	(2,242	)	$	(1,889	)

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

	Year Ended December 31,
	2021		2020
Current taxes:
Federal	$	—	$	—
State and local		—		—
Foreign		—		—
Current taxes		—		—
Deferred taxes:
Federal		—		—
State and local		—		—
Foreign		—		—
Deferred taxes		—		—
Total	$	—	$	—

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

	December 31,
	2021			2020
Deferred tax assets:
Net operating loss carryforwards	$	19,230		$	18,141
Research and development credit carryforwards		2,747			3,058
Stock-based compensation		382			449
Accrued expenses and reserves		58			137
Depreciation and amortization		—			38
Deferred revenue		107			253
Right of use liability		318			357
Other		7			23
Gross deferred tax assets		22,849			22,456
Less: valuation allowance		(22,544	)		(22,121	)
Net deferred tax assets		305			335
Deferred tax liabilities:
Depreciation and amortization		(16	)		—
Right of use asset		(289	)		(328	)
Net deferred tax assets	$	—		$	7

	December 31,
	2021		2020
Deferred tax assets, non-current	$	—	$	7
Deferred tax liability, non-current		—		—
Net deferred tax assets	$	—	$	7

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

	Year Ended December 31,
	2021					2020
U.S. Federal tax benefit at statutory rates	$	(471	)	21.0	%	$	(397	)	21.0	%
Impact of:
Tax credits		—		—			109		(5.8	)
State income tax		(83	)	3.7			(53	)	2.8
International operations		28		(1.3	)		(6	)	0.3
Stock-based compensation		93		(4.2	)		317		(16.8	)
Valuation allowance		429		(19.1	)		(1,224	)	64.8
Expiration of tax attributes		311		(13.9	)		1,330		(70.4	)
PPP loan forgiveness		(333	)	14.9			—		—
Other, net		26		(1.1	)		(76	)	4.0
Tax expense and effective tax rate	$	—		0.0	%	$	—		0.0	%