Note 6 - Income Taxes - Reconciliation of Income Taxes Rates (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Statutory rate	21.00%	21.00%
State and local taxes, net of federal benefit	4.70%	5.80%
Equity compensation	0.00%	0.30%
Research and development credit	(1.50%)	(2.60%)
Foreign tax credit	(1.30%)	(1.30%)
GILTI income inclusion	3.90%	0.00%
Other	0.30%	0.00%
Effective rate	27.10%	23.20%