Note 17 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Expense	$ 1,414	$ 976	$ 2,263	$ 1,793
Deferred tax benefit	(297)	(205)	(476)	(377)
Total net expense	1,117	771	1,787	1,416
Stock Appreciation Rights (SARs) [Member]
Expense	86	87	175	177
Deferred tax benefit	(18)	(18)	(37)	(37)
Total net expense	68	69	138	140
Restricted Stock [Member]
Expense	337	317	666	643
Deferred tax benefit	(71)	(67)	(140)	(135)
Total net expense	266	250	526	508
Restricted Stock Units (RSUs) [Member]
Expense	78	67	154	135
Deferred tax benefit	(16)	(14)	(32)	(28)
Total net expense	62	53	122	107
Performance Shares [Member]
Expense	913	505	1,268	838
Deferred tax benefit	(192)	(106)	(267)	(177)
Total net expense	$ 721	$ 399	$ 1,001	$ 661