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Note 12 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

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

		Years ended December 31,
		2024				2023
Tax at federal statutory rate		$	(1,669	)		$	(2,430	)
State, net of federal benefit			(364	)			(342	)
Research and development credit			(162	)			(267	)
Share-based compensation			176				178
Net operating loss expiration			233				130
Other			1				3
Change in valuation allowance			1,785				2,728
Total provision for income taxes		$	—			$	—

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

		Years ended December 31,
		2024				2023
Accrued compensation		$	160			$	147
Inventory adjustments			40				33
Depreciation and amortization			14				13
Share-based compensation			924				806
Net operating loss and tax credit carryforwards			34,539				32,910
Research and development capitalization			2,807				2,784
Other			13				19
Gross Deferred Tax Asset			38,497				36,712
Valuation Allowance			(38,497	)			(36,712	)
Net deferred tax asset		$	—			$	—

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

		Years ended December 31,
		2024				2023
Balance, beginning of year		$	1,677			$	1,519
Additions based on tax positions related to the current year			98				158
Balance, end of year		$	1,775			$	1,677

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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