Note 3 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

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

				Weighted- average Exercise
	Shares			Price Per Share
Outstanding, January 1, 2021		12,150		$	8.78
Exercised		(12,150	)		8.78
Outstanding, September 30, 2021		-			-
Exercisable, September 30, 2021		-			-

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

				Weighted-average Grant Date
	Units			Fair Value Per Unit
Nonvested at January 1, 2021		66,362		$	23.52
Granted		29,193			22.50
Vested		(17,622	)		(24.10	)
Nonvested at September 30, 2021		77,933		$	23.00
Expected to vest as of September 30, 2021		53,915		$	22.42