Note 14 - Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

	2019			2018			2017
Expected option life in years(1)		6.0			6.0			6.0
Expected stock price volatility percentage(2)		28	%		26	%		25	%
Risk-free interest rate percentage(3)		2.2	%		2.8	%		2.0	%
Expected dividend yield(4)		0.58	%		0.48	%		0.59	%
Fair value as of the date of grant	$	5.89		$	6.19		$	4.34

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

	Shares			Weighted Average Exercise Price
Outstanding at December 31, 2018		939,193		$	13.78
Granted		68,000			20.00
Exercised		(151,594	)		10.68
Forfeited		(13,270	)		15.73
Outstanding at December 31, 2019		842,329		$	14.81
Exercisable at December 31, 2019		523,677		$	12.69

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, 2018		393,480		$	4.72		5.2
Granted		68,000			5.89		6.5
Vested		(132,558	)		4.29		3.5
Forfeited		(10,270	)		4.37		3.6
Nonvested at December 31, 2019		318,652		$	5.18		5.1

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

	Shares			Weighted Average Grant Date Fair Value
Nonvested at December 31, 2018		185,909		$	14.89
Granted		70,000			19.89
Vested		(78,305	)(1)		15.88
Forfeited		(39,487	)		14.33
Nonvested at December 31, 2019		138,117		$	17.16