Note 13 - Stock Option Plan and Non-Employee Director Compensation Plan (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Stock Option Activity

Stock option activity during 2023, 2022, and 2021 was as follows:

	Number of options			Weighted average exercise price		Weighted average remaining contractual term (in years)		Aggregate intrinsic value
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
Exercised		—			—
Forfeited		(34,150	)		37.07
Granted		29,350			37.26
Outstanding at December 31, 2022		109,150			37.65
Exercised		—			—
Forfeited		(22,600	)		43.15
Granted		35,000			29.51
Outstanding at December 31, 2023		121,550		$	34.29		3.83	$	—
Exercisable at December 31, 2023		41,375		$	37.37		0.60	$	—

Outstanding Stock Options

As of December 31, 2023, outstanding stock options consist of the following:

	Options outstanding		Exercise price		Remaining life (in years)		Options exercisable		Exercise price
		35,000	$	29.51		9.13		—	$	—
		19,825		32.50		2.13		—		—
		19,650		36.50		1.13		19,650		36.50
		25,350		37.26		3.13		—		—
		21,725		38.15		0.13		21,725		38.15
Outstanding at December 31, 2023		121,550	$	34.29		3.83		41,375	$	37.37

Intrinsic Value Related to Stock Options Exercised

The intrinsic value related to total stock options exercised during 2023, 2022, and 2021 are as follows:

	2023		2022		2021
Intrinsic value of stock options exercised	$	—	$	—	$	31