Note 7 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

	Year Ended December 31,
	2022			2021
U.S.	$	(1,852	)	$	(820	)
Foreign		(2,006	)		(1,422	)
Total	$	(3,858	)	$	(2,242	)

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

	Year Ended December 31,
	2022		2021
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,
	2022			2021
Deferred tax assets:
Net operating loss carryforwards	$	17,309		$	19,230
Research and development credit carryforwards		2,302			2,747
Capitalized research and development		(31	)		—
Stock-based compensation		377			382
Accrued expenses and reserves		38			58
Depreciation and amortization		37			-
Deferred revenue		53			107
Lease liability		289			318
Other		46			7
Gross deferred tax assets		20,420			22,849
Less: valuation allowance		(20,161	)		(22,544	)
Net deferred tax assets		259			305
Deferred tax liabilities:
Depreciation and amortization		—			(16	)
Right-of-use asset		(259	)		(289	)
Net deferred tax assets	$	—		$	—

	December 31,
	2022		2021
Deferred tax assets, non-current	$	—	$	—
Deferred tax liability, non-current		—		—
Net deferred tax assets	$	—	$	—

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

	Year Ended December 31,
	2022					2021
U.S. Federal tax benefit at statutory rates	$	(811	)	21.0	%	$	(471	)	21.0	%
Impact of:
State income tax		(71	)	1.8			(83	)	3.7
International operations		218		(5.7	)		28		(1.3	)
Stock-based compensation		32		(0.8	)		93		(4.2	)
Valuation allowance		(2,383	)	61.7			429		(19.1	)
Expiration of tax attributes		3,000		(77.7	)		311		(13.9	)
PPP loan forgiveness		—		—			(333	)	14.9
Other, net		15		(0.4	)		26		(1.1	)
Tax expense and effective tax rate	$	—		0.0	%	$	—		0.0	%