Note 4 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2021		2020
Dividend yield		—		—
Expected volatility		51.6%		40.3%
Expected life of option (years)		10		10
Risk-free interest rate		0.5%		1.4%
Fair value of each option on grant date		$7.05		$2.90

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

				Weighted
				Average
				Exercise
	Shares			Price
Outstanding at January 1, 2021		17,500		$	6.97
Granted		10,000			11.50
Exercised		(3,833	)		8.78
Expired and forfeited		(1,000	)		10.75
Outstanding at September 30, 2021		22,667		$	8.50
Exercisable at September 30, 2021		5,166		$	6.54

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

				Weighted
				Average
	Number of			Grant Date
	Shares			Fair Value
Unvested shares at January 1, 2021		54,300		$	6.11
Granted		36,550			11.01
Vested		(1,340	)		11.30
Forfeited or surrendered		(2,700	)		6.69
Unvested shares at September 30, 2021		86,810		$	8.07