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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Schedule of activity under the stock option plans

		2000 Plan				2010 Plan				2017 Plan				Weighted Average Exercise Price				Aggregate Intrinsic Value(1)
Outstanding as of December 31, 2018			12,500				270,000				111,500			$	6.37			$	266,020
Grants			—				26,000				25,000			$	5.90
Terminations			—				(26,000	)			(3,000	)		$	6.05
Exercises			(12,500	)			(15,000	)			—			$	4.37
Outstanding as of December 31, 2019			—				255,000				133,500			$	6.48			$	(516,475	)
Grants			—				7,000				93,000			$	5.03
Terminations			—				(12,000	)			(50,000	)		$	5.45
Exercises			—				(12,500	)			—			$	3.15
Outstanding as of December 31, 2020			—				237,500				176,500			$	6.38			$	(180,038	)
Vested as of December 31, 2020			—				156,000				10,000			$	6.31			$	(59,290	)
Vested and expected to vest as of December 31, 2020			—				237,500				176,500			$	6.38			$	(180,038	)
Reserved for future grants			—				—				123,500

⁽¹⁾ Intrinsic value is the difference between the fair market value as of the date indicated and as of the date of the option grant (which is equal to the option exercise price).

Schedule of additional information about the stock option plans

		Number of Shares				Weighted Average Fair Value at Grant Date				Weighted Average Exercise Price
Non-vested stock options as of January 1, 2020			321,000			$	3.49			$	6.55
Non-vested stock options as of December 31, 2020			248,000			$	3.25			$	6.44
Stock options granted during the year ended December 31, 2020			100,000			$	2.47			$	5.03
Stock options that vested during the year ended December 31, 2020			113,000			$	3.48			$	6.06
Stock options that were forfeited during the year ended December 31, 2020			62,000			$	2.84			$	5.45

Schedule of fair value stock option grant using black-scholes option valuation model with the weighted-average assumptions

		During the Years Ended December 31,
		2020				2019
Risk-free interest rate			0.41	%			1.9	%
Dividend yield			0	%			0	%
Expected volatility			53	%			51	%
Expected life			6.1 years				6 years

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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