Note 12 - Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2021			2020			2019
Expected option life in years(1)		6.0			6.0			6.0
Expected stock price volatility percentage(2)		27	%		28	%		28	%
Risk-free interest rate percentage(3)		1.2	%		0.6	%		2.2	%
Expected dividend yield(4)		0.91	%		0.80	%		0.58	%
Fair value as of the date of grant	$	4.29		$	3.85		$	3.93

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

	Shares			Weighted Average Exercise Price
Outstanding at December 31, 2020		711,780		$	11.47
Granted		429,500			17.00
Exercised		(98,512	)		8.88
Forfeited		(13,302	)		14.46
Outstanding at December 31, 2021		1,029,466		$	14.00
Exercisable at December 31, 2021		398,415		$	10.97

Schedule of Nonvested Share Activity [Table Text Block]

	Shares			Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life (in Years)
Nonvested at December 31, 2020		332,562		$	3.71		4.8
Granted		429,500			4.29		6.7
Vested		(118,009	)		3.48		3.4
Forfeited		(13,002	)		4.02		4.3
Nonvested at December 31, 2021		631,051		$	4.14		5.9

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

	Shares			Weighted Average Grant Date Fair Value
Nonvested at December 31, 2020		154,361		$	13.99
Granted		98,400			17.36
Vested		(120,635	) (1)		14.43
Nonvested at December 31, 2021		132,126		$	16.10