Note I - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Expense (Benefit), Total	$ 172	$ (53)	$ 1,018	$ (12,863)
Effective Income Tax Rate Reconciliation, Percent, Total	3.80%	3.20%	7.20%	82.40%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%	21.00%
Expected Proceeds from Income Tax Refunds, Carryback of Loss			$ 7,600
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