Note 13 - Stock Option Plan (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Option Activity

Stock option activity during 2021, 2020, and 2019 was as follows:

	Number of options			Weighted average exercise price		Weighted average remaining contractual term (in years)		Aggregate intrinsic value
Outstanding at December 31, 2018		95,075			35.11
Exercised		(14,925	)		27.16
Forfeited		(1,500	)		37.20
Granted		24,700			38.15
Outstanding at December 31, 2019		103,350			36.96
Exercised		(9,550	)		29.39
Forfeited		(2,250	)		39.86
Granted		25,000			36.50
Outstanding at December 31, 2020		116,550			37.42
Exercised		(19,025	)		30.97
Forfeited		(8,575	)		35.27
Granted		25,000			32.50
Outstanding at December 31, 2021		113,950		$	37.58		2.20	$	84
Exercisable at December 31, 2021		43,125		$	40.72		0.65	$	—

Outstanding Stock Options

As of December 31, 2021, outstanding stock options consist of the following:

	Options outstanding		Exercise price		Remaining life (in years)		Options exercisable		Exercise price
		24,000	$	32.50		4.13		—	$	—
		24,200		36.50		3.13		—		—
		20,700		37.60		0.13		20,700		37.60
		22,625		38.15		2.13		—		—
		22,425		43.60		1.14		22,425		43.60
Outstanding at December 31, 2021		113,950	$	37.58		2.20		43,125	$	40.72

Intrinsic Value Related to Stock Options Exercised

The intrinsic value related to total stock options exercised during 2021, 2020, and 2019 are as follows:

	2021		2020		2019
Intrinsic value of stock options exercised	$	31	$	81	$	153