Note 18 - Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

						Weighted-Average		Aggregate
				Weighted-Average		Remaining Contractual		Intrinsic
	Shares			Exercise Price		Life (in years)		Value (in thousands)
Balance, December 31, 2017		35,880			23.37		0.10	$	675
Exercised		(35,880	)	$	23.37
Balance, December 31, 2018		—			—		—	$	—
Balance, December 31, 2019		—			—		—	$	—
Balance, December 31, 2020		—			—		—	$	—

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, 2017		221,738			32.72		339,872			33.52
Granted		141,810			43.30		55,455			39.46
Vested		(65,721	)		41.59		(121,336	)		37.87
Forfeited		(13,334	)		35.96		(8,332	)		29.61
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