Note F - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

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

	2023					2022					2021
	Shares			Weighted Average Fair Value at Grant Date		Shares			Weighted Average Fair Value at Grant Date		Shares			Weighted Average Fair Value at Grant Date
Non-vested at beginning of period		32,336		$	89.49		28,934		$	95.54		22,721		$	96.82
Granted		1,487			77.03		7,271			70.72		9,238			90.01
Vested		(4,109	)		68.46		(3,482	)		100.05		(2,981	)		88.23
Forfeited		(43	)		93.29		(387	)		93.91		(44	)		88.41
Non-vested at end of period		29,671		$	88.37		32,336		$	89.49		28,934		$	95.54