Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Class Of Stock [Line Items]

Schedule of Assumptions for Fair Value of Option Grant

In connection with the stock option grants during 2020 and 2019, the fair value of each option grant was estimated on the date of the grant using the Black-Scholes option pricing model with the following assumptions:

	2020		2019
Risk-free interest rate	0% - 2%		2% - 3%
Expected life (years)		6.8		6.8
Expected volatility	74%		73%
Expected dividend yield	Zero		Zero

Schedule of Changes in Common Stock Options

The following summarizes the changes in common stock options for 2020 and 2019:

	2020					2019
	Options			Weighted Average Exercise Price		Options			Weighted Average Exercise Price
Outstanding at beginning of year		3,611,850		$	0.51		4,303,900		$	0.75
Granted		474,750		$	1.62		649,850		$	0.74
Exercised		(383,350	)	$	0.46		(31,276	)	$	0.45
Expired		(20,000	)	$	0.83		(765,000	)	$	2.00
Forfeited		(167,025	)	$	1.15		(545,624	)	$	0.61
Outstanding at end of year		3,516,225		$	0.63		3,611,850		$	0.51
Options exercisable at year end		2,566,100		$	0.47		2,157,336		$	0.46
Weighted-average fair value of options granted    during the year				$	1.10				$	0.50

Schedule of Information about All Stock Options Outstanding

The following table summarizes information about all stock options outstanding at December 31, 2020:

Exercise price	Options Outstanding		Weighted Average Remaining Life(years)		Weighted Average Exercise Price		Number Exercisable		Weighted Average Remaining Life (years)		Weighted Average Exercise Price
$ 0.24 to $ 0.40		100,000		6.4	$	0.34		75,000		6.2	$	0.31
$ 0.42 to $ 0.48		2,357,600		6.0	$	0.45		2,279,350		5.9	$	0.45
$ 0.53 to $ 1.00		758,625		7.9	$	0.77		211,750		5.9	$	0.73
$ 1.41 to $ 2.77		300,000		9.5	$	1.76		—	N/A		N/A
		3,516,225		6.7	$	0.63		2,566,100		5.9	$	0.47

Other Options Issued [Member]

Class Of Stock [Line Items]

Schedule of Stock Options and Other Stock Options Issued

Other Options	2020			2019
Options outstanding, beginning of year		265,000			625,000
Options issued		90,000			265,000
Options exercised		(10,625	)		—
Options expired		—			(625,000	)
Options outstanding, end of year		344,375			265,000

2003 Stock Option and Appreciation Rights Plan [Member]

Class Of Stock [Line Items]

Schedule of Stock Options and Other Stock Options Issued

2003 Plan	2020			2019
Options outstanding, beginning of year		20,000			310,000
Options expired		(20,000	)		(140,000	)
Options forfeited		—			(150,000	)
Options outstanding, end of year		—			20,000

2010 Non-Qualified Stock Option Plan [Member]

Class Of Stock [Line Items]

Schedule of Stock Options and Other Stock Options Issued

2010 Plan	2020		2019
Options outstanding, beginning of year		975,000		915,000
Options granted		125,000		60,000
Options outstanding, end of year		1,100,000		975,000

2016 Stock Option Plan [Member]

Class Of Stock [Line Items]

Schedule of Stock Options and Other Stock Options Issued

2016 Plan	2020			2019
Options outstanding, beginning of year		2,351,850			2,453,900
Options granted		259,750			324,850
Options exercised		(372,725	)		(31,276	)
Options forfeited		(167,025	)		(395,624	)
Options outstanding, end of year		2,071,850			2,351,850