Note 16 - Stock-based Compensation - Unrecognized Stock-based Compensation Expense (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Remainder of 2021	$ 2,625
2022	2,414
2023	1,630
2024	780
2025	457
2026	45
Total estimated expense	7,951
Stock Appreciation Rights (SARs) [Member]
Remainder of 2021	262
2022	305
2023	230
2024	124
2025	65
2026	9
Total estimated expense	995
Restricted Stock [Member]
Remainder of 2021	992
2022	1,126
2023	910
2024	656
2025	392
2026	36
Total estimated expense	4,112
Restricted Stock Units (RSUs) [Member]
Remainder of 2021	237
2022	3
2023	0
2024	0
2025	0
2026	0
Total estimated expense	240
Performance Shares [Member]
Remainder of 2021	1,134
2022	980
2023	490
2024	0
2025	0
2026	0
Total estimated expense	$ 2,604