Note 18 - Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

	Time-Based RSUs					Performance-Based RSUs
				Weighted-Average					Weighted-Average
				Grant Date					Grant Date
	Shares			Fair Value		Shares			Fair Value
Balance at December 31, 2018		284,493			35.79		265,659			32.90
Granted		108,925			36.37		124,586			36.37
Vested		(93,729	)		35.14		(92,501	)		38.36
Forfeited		(26,489	)		39.34		—			—
Balance at December 31, 2019		273,200			35.90		297,744			32.65
Granted		110,495			21.79		212,369			22.96
Vested		(80,654	)		25.34		(193,240	)		21.68
Forfeited		(10,371	)		39.04		(14,071	)		39.08
Balance at December 31, 2020		292,670			33.37		302,802			32.55
Granted		63,467			41.18		113,764			37.13
Vested		(96,869	)		41.72		(76,292	)		41.69
Forfeited		(23,324	)		29.92		(7,768	)		40.85
Balance at December 31, 2021		235,944			32.38		332,506			31.82