Note 7 - Share-based Compensation - Shared-based Compensation Expense and the Related Tax Benefit (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-based compensation expense	$ 928	$ 1,088	$ 3,382	$ 2,757
Stock Options and SARs [Member]
Share-based compensation expense	339	327	1,080	1,105
Restricted Stock [Member]
Share-based compensation expense	446	545	2,050	1,183
Performance Shares [Member]
Share-based compensation expense	$ 143	$ 216	$ 252	$ 469