Note 13 - Income Taxes - Reconciliations of Federal Statutory Rate to Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statutory federal income tax rate	21.00%	21.00%
Non-taxed loss from VIE	0.00%	0.00%
Research credits	0.00%	13.50%
State taxes, net of federal tax benefit	6.00%	5.30%
Stock compensation	(4.30%)	(4.50%)
Permanent Items	(0.40%)	0.10%
Section 382 NOL Adjustments	(0.20%)	0.00%
Derivatives	4.20%	2.60%
Return to provision adjustments	2.00%	0.10%
Other	2.00%	(3.90%)
Change in valuation allowance	(30.30%)	(28.80%)
Total effective tax rate	0.00%	5.40%