Note 7 - Share-based Compensation - Shared-based Compensation Expense and the Related Tax Benefit (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based compensation expense	$ 1,212	$ 832
Stock Options and SARs [Member]
Share-based compensation expense	360	452
Restricted Stock [Member]
Share-based compensation expense	619	203
Performance Shares [Member]
Share-based compensation expense	$ 233	$ 177