Note 8 - Income Taxes - Reconciliation of the U.S. Statutory Income Tax Rate to Effective Tax Rate (Details)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statutory U.S. income tax rate		21.00%	21.00%	21.00%
State income tax, net of federal effect		1.00%	1.40%	0.60%
Global intangible low-taxed income		(0.20%)	0.50%	(1.20%)
Foreign derived intangible income		(1.30%)		(8.50%)
Remeasurement of deferred tax assets and liabilities			(13.40%)	(0.60%)
Differential arising from foreign earnings (1)	[1]	2.00%	15.20%	5.40%
IRS settlements & change in reserve		1.60%	12.10%	8.50%
Valuation allowance		(0.50%)	2.50%	(3.70%)
Tax credits		(2.60%)	(29.70%)	(2.80%)
Stock compensation		(1.50%)	(1.70%)	(0.60%)
Legal entity rationalization			(2.20%)
Intercompany loan adjustment			(6.20%)	0.50%
Non-deductible expenses		1.40%	7.00%	2.10%
Other items, net		(0.80%)	(0.10%)	(1.00%)
Effective income tax rate		20.50%	17.80%	21.10%

[1] Includes impact of intercompany asset sales.