Note 7 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2022

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, 2021		235,944		$	32.38		332,506		$	31.82
Granted		65,389			46.85		112,393			40.24
Vested		(18,380	)		45.80		(81,934	)		44.52
Forfeited		(9,879	)		33.42		—			—
Balance at June 30, 2022		273,074		$	34.90		362,965		$	31.56