Note 7 - Share-based Compensation - Shared-based Compensation Expense and the Related Tax Benefit (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based compensation expense	$ 1,242	$ 837	$ 2,454	$ 1,669
Stock Options and SARs [Member]
Share-based compensation expense	381	326	741	778
Restricted Stock [Member]
Share-based compensation expense	985	435	1,604	638
Performance Shares [Member]
Share-based compensation expense	$ (124)	$ 76	$ 109	$ 253