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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 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 at 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 at December 31, 2019			—				255,000				133,500			$	6.48			$	(516,475	)
Grants			—				7,000				37,000			$	4.40
Terminations			—				(8,000	)			(4,000	)		$	5.53
Exercises			—				—				—			$	—
Outstanding at June 30, 2020			—				254,000				166,500			$	6.29			$	(655,695	)
Vested at June 30, 2020			—				165,500				10,000			$	6.04			$	(229,450	)
Vested and expected to vest at
June 30, 2020			—				254,000				166,500			$	6.29			$	(655,695	)
Reserved for future grants			—				—				133,500

⁽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.

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 June 30, 2020			245,000			$	3.28			$	6.47
Stock options granted during the six-month period ended June 30, 2020			44,000			$	2.03			$	4.40
Stock options that vested during the six-month period ended June 30, 2020			108,000			$	3.43			$	5.98
Stock options that were forfeited during the six-month period ended June 30, 2020			12,000			$	2.91			$	5.53

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

		During the Three-Month Period Ended June 30, 2020		During the Three-Month Period Ended June 30, 2019		During the Six-Month Period Ended June 30, 2020		During the Six-Month Period Ended June 30, 2019
Risk-free interest rate		0.29%		1.81%		0.54%		2.20%
Dividend yield		0%		0%		0%		0%
Expected volatility		50%		52%		51%		52%
Expected life		4.8 years		6.5 years		5.6 years		5.3 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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