Note 14 - Income Taxes - Schedule of Effective Tax Rate of Provision for Income Taxes differs from Federal Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Federal statutory rate	$ (13,963)	$ (10,368)
Federal statutory rate	21.00%	21.00%
State and local income tax, net of federal (national) income tax effect	$ (4,416)	$ (3,454)
State and local income tax, net of federal (national) income tax effect	6.60%	7.00%
Foreign Tax Effects	$ 0	$ 0
Foreign Tax Effects	0.00%	0.00%
Effect of changes in tax laws or rates enacted in the current period	$ 0	$ 0
Effect of changes in tax laws or rates enacted in the current period	0.00%	0.00%
Effect of cross-border tax laws	$ 0	$ 0
Effect of cross-border tax laws	0.00%	0.00%
Research and development tax credits, amount	$ (2,045)	$ (2,864)
Research and development tax credits, percent	3.10%	5.80%
Changes in valuation allowance	$ 19,744	$ 15,778
Changes in valuation allowance	(29.80%)	(32.00%)
Stock compensation & other nondeductible expenses	$ 680	$ 532
Stock compensation & other nondeductible expenses	(0.90%)	(1.10%)
Changes in unrecognized tax benefits	$ 0	$ 0
Changes in unrecognized tax benefits	0.00%	0.00%
Other	$ 0	$ 376
Other	0.00%	(0.70%)
Effective income tax rate	$ 0	$ 0
Effective income tax rate	0.00%	0.00%