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Note 11 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

		2022								2021								2020
		Shares				Weighted Average Fair Value				Shares				Weighted Average Fair Value				Shares				Weighted Average Fair Value
Nonvested at beginning of year			353,691			$	30.71				262,336			$	29.42				262,260			$	34.91
Granted			121,631				32.18				163,000				33.68				121,518				24.65
Vested			(94,010	)			34.86				(59,772	)			31.82				(85,445	)			37.08
Forfeited			(6,541	)			27.98				(11,873	)			29.54				(35,997	)			33.71
Nonvested at end of year			374,771			$	30.49				353,691			$	30.71				262,336			$	29.42

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

		2022								2021								2020
		Shares				Weighted Average Exercise Price				Shares				Weighted Average Exercise Price				Shares				Weighted Average Exercise Price
Outstanding at beginning of year			7,700			$	34.89				9,700			$	32.83				10,700			$	30.25
Granted			0				NA				0				NA				0				NA
Exercised			(2,700	)			32.42				(2,000	)			24.91				(1,000	)			5.19
Forfeited or expired			0				NA				0				NA				0				NA
Outstanding at end of year			5,000			$	36.22				7,700			$	34.89				9,700			$	32.83
Options exercisable at year-end			5,000			$	36.22				7,700			$	34.89				9,700			$	32.83

Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

				Outstanding												Exercisable
								Weighted Average				Weighted								Weighted
Range of								Remaining				Average								Average
Exercise								Contractual				Exercise								Exercise
Prices				Number				Life (Years)				Price				Number				Price
$36.00	-	$37.00			5,000				0.9			$	36.22				5,000			$	36.22
Outstanding at year end					5,000				0.9			$	36.22				5,000			$	36.22

Schedule of Share-based Compensation Shares Authorized Under Stock Option Plans Information Related to Option Outstanding [Table Text Block]

		2022				2021				2020
Minimum exercise price		$	36.22			$	27.66			$	22.15
Maximum exercise price			36.22				36.22				36.22
Average remaining option term (years)			0.9				1.7				2.4

Schedule of Share Based Compensation Arrangement by Share Based Payment Award Options Information Related to Stock Option Grants and Exercised [Table Text Block]

		2022				2021				2020
Aggregate intrinsic value of stock options exercised		$	16,000			$	13,000			$	17,000
Cash received from stock option exercises			36,000				50,000				3,000
Tax benefit realized from stock option exercises			0				0				0
Weighted average per share fair value of stock options granted			NA				NA				NA

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