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Note 19 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

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

		For the Years Ended December 31,
		2024				2023
United States		$	(7,223	)		$	(9,640	)
International			—				—
		$	(7,223	)		$	(9,640	)

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

		For the Years Ended December 31,
		2024				2023
Current
Federal		$	—			$	—
State			—				—
Other			—				—
Total current tax expense		$	—			$	—
Deferred
Federal			—				—
State			—				—
Other			—				—
Total deferred tax expense		$	—			$	—
Income tax provision		$	—			$	—

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

		For the Years Ended December 31,
		2024				2023
Deferred tax assets:
Net operating losses		$	40,689			$	36,943
Stock options			573				665
Research and development credits			641				641
Accruals			311				477
Operating lease liabilities			245				368
Property and equipment			18				28
Acquisition assets			-				2,257
Other deferred tax assets			6				6
Total deferred tax assets			42,483				41,385
Deferred tax liabilities:
Operating lease right-of-use assets			(245	)			(337	)
Total deferred tax liabilities			(245	)			(337	)
Valuation allowance			(42,238	)			(41,048	)
Net deferred taxes		$	—			$	—

Summary of Operating Loss Carryforwards and Tax Credit Carryforwards [Table Text Block]

					Expiration
		Amount			Years
Net operating losses, federal (Post December 31, 2017)		$	59,595		Does Not Expire
Net operating losses, federal (Pre January 1, 2018)		$	94,140		Beginning in 2025
Net operating losses, state		$	128,588		Beginning in 2028
Tax credits, federal		$	542		Beginning in 2031
Tax credits, state		$	125		Indefinite

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

		For the Years Ended December 31,
		2024				2023
Unrecognized benefit - beginning of period		$	974			$	974
Change during the period			—				—
Unrecognized benefit - end of period		$	974			$	974

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

		For the Years Ended December 31,
		2024				2023
Statutory rate			21.0	%			21.0	%
State tax			3.1	%			4.5	%
Stock-based compensation expense			(1.4	%)			(1.4	%)
Change in valuation allowance			(16.5	%)			(19.5	%)
Warrant/equity expenses			(4.0	%)			(3.7	%)
Expiration of tax attributes			(2.2	%)			—	%
Impairment of assets			-	%			(0.9	%)
Other			-	%			(0.1	%)
Total			0.0	%			0.0	%

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