Note 8. Stock Options and Restricted Stock Units (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Summary of stock options activity

	Number of Options Outstanding			Range of Exercise Price		Weighted Average Exercise Price		Aggregate Intrinsic Value
Balance on December 31, 2018		98,563		$	6.80 - 17.40	$	12.56	$	127,306
Options granted		31,500			10.75 - 13.21		12.90		—
Options exercised		—			—		—		—
Options forfeited/cancelled		(2,500	)		13.21		13.21		—
Balance on December 31, 2019		127,563		$	6.80 - 17.40	$	12.63	$	142,818
Options granted		—			—		—		—
Options exercised		(36,250	)		7.76 - 17.40		12.47		295,921
Options forfeited/cancelled		(16,083	)		9.26 -17.40		15.17		22,682
Balance on December 31, 2020		75,230		$	6.80 - 17.40	$	12.16	$	402,275

Schedule of unvested stock options

	Number of Options Outstanding			Weighted Average Exercise Price		Weighted Average Grant Date Fair Value
Balance on December 31, 2018		29,000		$	12.87	$	5.47
Options vested		—			—		—
Options forfeited/cancelled		—			—		—
Balance on December 31, 2019		29,000		$	12.87	$	5.47
Options vested		(14,500	)		12.87		5.47
Options forfeited/cancelled		—			—		—
Balance on December 31, 2020		14,500		$	12.87	$	5.47

Schedule of stock options

		Options Outstanding						Options Exercisable
Exercise Price Range		Number		Weighted Average Remaining Contractual Life (in Years)		Weighted Average Exercise Price		Number
$	0.01 - 7.00		10,000		4.88	$	6.80		10,000
$	7.01 - 8.00		10,313		2.74	$	7.76		10,313
$	8.01 - 12.00		7,167		5.87	$	9.88		5,167
$	12.01 - 15.00		31,750		7.80	$	13.16		19,250
$	15.01 - 17.40		16,000		7.42	$	17.40		16,000
	Total		75,230		6.46	$	12.16		60,730

Schedule of stock options, valuation assumptions

	Year ended December 31, 2019
Expected dividend yield		1.56%
Expected stock price volatility		50%
Weighted-average risk-free interest rate		2.45%
Weighted-average expected life of options (in years)		5.75

Summary of restricted stock units issued

	Number of RSUs Outstanding			Weighted Average Fair Value		Aggregate Intrinsic Value
Balance on December 31, 2018		36,669		$	8.76	$	257,987
Units granted		46,000			11.57		532,220
Units vested/issued		(33,000	)		8.62		400,700
Units forfeited		(1,667	)		8.85		14,753
Balance on December 31, 2019		48,002		$	11.55	$	554,388
Units granted		18,000			10.67		192,060
Units vested/issued		(32,002	)		11.61		353,948
Units forfeited		(15,000	)		11.35		156,665
Balance on December 31, 2020		19,000		$	10.78	$	332,690