Note I - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Expense (Benefit), Total	$ 591	$ (11,294)
Effective Income Tax Rate Reconciliation, Percent, Total	(50.60%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Expected Proceeds from Income Tax Refunds, Carryback of Loss	$ 7,500
State and Local Jurisdiction [Member]
Open Tax Year	2014 2015 2016 2017 2018 2019 2020
Foreign Tax Authority [Member]
Open Tax Year	2016 2017 2018 2019 2020
Tax Year 2019 [Member]
Proceeds from Income Tax Refunds	$ 6,400
Tax Year 2018 [Member]
Proceeds from Income Tax Refunds	$ 3,200