Note 4 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 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	$	6.84		$	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		(3,000	)		9.23
Expired and forfeited		(1,000	)		10.75
Outstanding at June 30, 2021		23,500		$	8.45
Exercisable at June 30, 2021		5,165		$	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		(2,400	)		6.11
Unvested shares at June 30, 2021		87,110			8.09