Note 15 - Stock-based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

				Weighted
	Number			Average
	of			Grant-Date
	Shares			Fair Value
Nonvested at beginning of year		32,650		$	53.93
Granted		-			-
Vested		(10,300	)		51.69
Forfeited		-			-
Nonvested at end of year		22,350		$	54.96