Note 16 - Stock Option Plan (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

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

	March 2023			December 2022			May 2022			July 2021			January 2021
Expected volatility		28.4	%		28.9	%		29.5	%		31.6	%		30.8	%
Expected term (years)		8.0			8.0			6.0			6.0			6.0
Expected dividends		2.92	%		2.55	%		2.52	%		1.98	%		1.86	%
Risk free rate		4.27	%		4.00	%		2.71	%		0.48	%		0.26	%
Grant date fair value	$	5.49		$	6.16		$	5.28		$	5.69		$	4.14

Share-Based Payment Arrangement, Option and Stock Appreciation Rights, Activity [Table Text Block]

						Weighted-
				Weighted-		Average
				Average		Remaining		Aggregate
				Exercise		Contractual		Intrinsic
(dollars in thousands, except for shares and per share data)	Shares			Price		Term in years		Value
Outstanding at beginning of year		454,610		$	16.97
Granted		30,000			19.87
Exercised		(19,403	)		15.18
Forfeited/cancelled		(67,304	)		15.04
Outstanding at end of period		397,903		$	17.61		3.86	$	703
Options exercisable		332,232		$	17.26		3.05	$	657

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

				Weighted-Average
				Grant Date
	Shares			Fair Value
Outstanding at beginning of year		14,786		$	27.16
Granted		48,748			18.25
Vested		(20,374	)		23.35
Outstanding at end of period		43,160		$	18.89