Note 7 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

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

	Year Ended December 31,
	2024		2023
Current expense (benefit):
Federal	$	—	$	—
State		—		—
Foreign		—		—
Current income tax benefit		—		—
Deferred expense (benefit):
Federal		—		—
State		—		—
Foreign		—		—
Deferred income tax expense		—		—
Total	$	—	$	—

Summary of Valuation Allowance [Table Text Block]

	Year Ended December 31,
	2024		2023
Valuation allowance at beginning of period	$	32,308	$	25,696
Change charged to expense (income)		6,329		6,612
Release of valuation allowance		—		—
Valuation allowance at end of period	$	38,637	$	32,308

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

	Year Ended December 31,
	2024						2023
	Amount			Percent			Amount			Percent
Federal tax benefit at statutory rate	$	4,570			21.0	%	$	6,251			21.0	%
State tax benefit net of federal		701			3.2	%		118			0.4	%
Foreign rate differential		17			0.1	%		59			0.2	%
Change in deferred tax rates		34			0.2	%		—			—	%
Stock warrant costs		1,286			5.9	%		(219	)		(0.8	)%
Other permanent differences		(60	)		(0.3	)%		(73	)		(0.2	)%
Permanent provision to return items		(134	)		(0.6	)%		662			2.3	%
Stock compensation change		(85	)		(0.4	)%		(82	)		(0.3	)%
Uncertain tax provision		—			—	%		(103	)		(0.4	)%
Increase in valuation allowance		(6,329	)		(29.1	)%		(6,613	)		(22.2	)%
Total tax (expense) benefit	$	—			—	%	$	—			—	%

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

	Year Ended December 31,
	2024			2023
Deferred tax assets:
Start-up costs	$	11,792		$	9,621
Federal net operating loss carryforwards		12,965			11,598
174 R&D Carryforward		8,935			6,636
State tax loss carryforwards		560			258
Foreign net operating loss carryforwards		332			377
Fixed Assets		14			9
Tax credit carryforward		1,919			1,919
ROU Liability		104			123
Deferred compensation		2,108			1,879
Total deferred tax assets	$	38,729		$	32,420
Less valuation allowance		(38,637	)		(32,308	)
Net deferred tax assets	$	92		$	112
Deferred tax liabilities:
ROU Asset	$	(92	)	$	(112	)
Total deferred tax liabilities	$	(92	)	$	(112	)
Net deferred taxes	$	—		$	—

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

	Year Ended December 31,
	2024		2023
Balance, beginning of year	$	339	$	236
Additions for tax positions related to the current year		—		103
Additions for tax positions related to prior years		—		—
Reductions due to lapse of statutes of limitations		—		—
Decreases related to settlements with tax authorities		—		—
Balance, end of year	$	339	$	339