Note 7 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

	Year Ended December 31,
	2022		2021
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,
	2022		2021
Valuation allowance at beginning of period	$	18,823	$	13,867
Income tax benefit		6,873		4,956
Release of valuation allowance		—		—
Valuation allowance at end of period	$	25,696	$	18,823

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

	Year Ended December 31,
	2022						2021
	Amount			Percent			Amount			Percent
Federal tax benefit at statutory rate	$	6,096			21.0	%	$	3,338			21.0	%
State tax benefit net of federal		347			1.2	%		25			0.2	%
Foreign rate differential		10			0.0	%		7			0.0	%
Stock warrant costs		280			1.0	%		1,413			8.9	%
Other permanent differences		(145	)		(0.5	)%		(77	)		(0.5	)%
Permanent provision to return items		395			1.4	%		344			2.2	%
Stock compensation change		(49	)		(0.2	)%		(37	)		(0.2	)%
Uncertain tax provision		(61	)		(0.2	)%		(57	)		(0.4	)%
Increase in valuation allowance		(6,873	)		(23.7	)%		(4,956	)		(31.2	)%
Total tax (expense) benefit	$	—			—	%	$	—			—	%

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

	Year Ended December 31,
	2022			2021
Deferred tax assets:
Start-up costs	$	7,727		$	5,618
Federal net operating loss carryforwards		11,024			10,866
174 R&D Carryforward		3,572			—
State tax loss carryforwards		237			64
Foreign net operating loss carryforwards		161			122
Tax credit carryforward		1,335			991
ROU Liability		96			34
Deferred compensation		1,630			1,157
Total deferred tax assets	$	25,782		$	18,852
Less valuation allowance		(25,696	)		(18,823	)
Net deferred tax assets	$	86		$	29
Deferred tax liabilities:
Fixed assets	$	-		$	(6	)
ROU Asset		(86	)		(23	)
Total deferred tax liabilities	$	(86	)	$	(29	)
Net deferred taxes	$	—		$	—

Summary of Income Tax Contingencies [Table Text Block]

	Year Ended December 31,
	2022		2021
Balance, beginning of year	$	175	$	118
Additions for tax positions related to the current year		—		—
Additions for tax positions related to prior years		61		57
Reductions due to lapse of statutes of limitations		—		—
Decreases related to settlements with tax authorities		—		—
Balance, end of year	$	236	$	175