Note 17 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Expense	$ 1,165	$ 843	$ 3,428	$ 2,636
Deferred tax benefit	(245)	(179)	(721)	(552)
Total net expense	920	664	2,707	2,084
Stock Appreciation Rights (SARs) [Member]
Expense	88	88	264	265
Deferred tax benefit	(18)	(19)	(55)	(56)
Total net expense	70	69	209	209
Restricted Stock [Member]
Expense	312	424	978	1,064
Deferred tax benefit	(66)	(90)	(206)	(223)
Total net expense	246	334	772	841
Restricted Stock Units (RSUs) [Member]
Expense	79	67	233	202
Deferred tax benefit	(17)	(14)	(49)	(42)
Total net expense	62	53	184	160
Performance Shares [Member]
Expense	686	264	1,953	1,105
Deferred tax benefit	(144)	(56)	(411)	(231)
Total net expense	$ 542	$ 208	$ 1,542	$ 874