Note 14 - Stock-based Compensation - Unrecognized Stock-based Compensation Expense (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Remainder of 2019	$ 848
2020	2,198
2021	1,529
2022	743
2023	422
2024	35
Total estimated expense	5,775
Stock Appreciation Rights (SARs) [Member]
Remainder of 2019	88
2020	306
2021	248
2022	193
2023	118
2024	11
Total estimated expense	964
Restricted Stock [Member]
Remainder of 2019	296
2020	1,037
2021	819
2022	550
2023	304
2024	24
Total estimated expense	3,030
Restricted Stock Units (RSUs) [Member]
Remainder of 2019	83
2020	2
2021	0
2022	0
2023	0
2024	0
Total estimated expense	85
Performance Shares [Member]
Remainder of 2019	381
2020	853
2021	462
2022	0
2023	0
2024	0
Total estimated expense	$ 1,696