Note 17 - Stock-based Compensation - Unrecognized Stock-based Compensation Expense (Details) $ in Thousands	Dec. 31, 2019 USD ($)
2020	$ 2,196
2021	1,526
2022	740
2023	420
2024	35
2025	0
Total estimated expense	4,917
Stock Appreciation Rights (SARs) [Member]
2020	306
2021	248
2022	193
2023	118
2024	11
2025	0
Total estimated expense	876
Restricted Stock [Member]
2020	1,035
2021	816
2022	547
2023	302
2024	24
2025	0
Total estimated expense	2,724
Restricted Stock Units (RSUs) [Member]
2020	2
2021	0
2022	0
2023	0
2024	0
2025	0
Total estimated expense	2
Performance Shares [Member]
2020	853
2021	462
2022	0
2023	0
2024	0
2025	0
Total estimated expense	$ 1,315