Note 14 - Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statutory U.S. federal income tax rate	21.00%	21.00%
State and local income taxes, net of federal income tax benefit	0.60%	3.30%
Other permanent differences	0.40%	(0.60%)
Change in valuation allowance	22.80%	(26.30%)
162(m)	0.50%	0.00%
Other	0.20%	(2.10%)
Other deferred adjustment	(7.50%)	4.30%
AMP credits	(35.20%)	0.00%
Effective income tax rate	2.80%	(0.40%)