Note 12 - Income Taxes - Effective Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
State and local taxes	1.60%	0.50%	0.70%
Change in fair value of common stock warrant	(0.20%)	0.00%	1.00%
Section 162(m) limitation	0.70%	0.50%	0.50%
Other	0.10%	0.20%	0.20%
Effective tax rate	23.20%	22.20%	23.40%