Note 8 - Income Taxes (Restated) (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Expense (Benefit), Total	$ (840)	$ 3,700	$ 1,910	$ 4,950
Effective Income Tax Rate Reconciliation, Percent, Total	15.20%	19.60%	10.20%	21.10%
Effective Income Tax Rate Reconciliation, Reversal of Deferred Tax Liability From Termination of Defined Benefit Plan, Amount	$ 1,800		$ 1,800
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount	(800)		(800)
Income Tax Expense Related to Termination of Defined Benefit Plan	$ (600)		$ (600)