Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Deferred Tax Assets, Valuation Allowance, Total		$ 2,200
Income Tax Expense (Benefit), Total	$ (6,849)	$ 5,874
Unrecognized Tax Benefits, Ending Balance	400
Foreign Tax Authority [Member]
Deferred Tax Assets, Valuation Allowance, Total	$ 7,700
Open Tax Year	2016 2017 2018 2019 2020 2021
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year	2017 2018 2019 2020 2021