Note 17 - Income Taxes - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Tax at statutory rate	21.00%	21.00%	21.00%
State and local taxes, net of federal benefit	2.20%	3.50%	1.90%
Effect of foreign operations	(6.30%)	(3.70%)	3.50%
Effect of changes in valuation allowances	(4.50%)	0.50%	(9.70%)
Excess tax benefits on share-based compensation	1.80%	2.10%	2.50%
Share-based payments	(0.90%)	(0.90%)	(2.00%)
Research and development credit	(1.40%)	(3.30%)	(1.90%)
Other, net	0.60%	(1.30%)	(0.20%)
Effective income tax rate	12.50%	17.90%	15.10%