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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2019
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, 2017 |  |  | 117,500 |  |  |  | 242,500 |  |  |  | — |  |  | $ | 4.58 |  |  | $ | 1,513,980 |
Grants |  |  | — |  |  |  | 48,500 |  |  |  | 122,500 |  |  | $ | 7.38 |  |  |  |  |
Terminations |  |  | — |  |  |  | (19,000 | ) |  |  | (11,000 | ) |  | $ | 6.63 |  |  |  |  |
Exercises |  |  | (105,000 | ) |  |  | (2,000 | ) |  |  | — |  |  | $ | 1.89 |  |  |  |  |
Outstanding at December 31, 2018 |  |  | 12,500 |  |  |  | 270,000 |  |  |  | 111,500 |  |  | $ | 6.37 |  |  | $ | 266,020 |
Grants |  |  | — |  |  |  | — |  |  |  | 10,000 |  |  | $ | 7.50 |  |  |  |  |
Terminations |  |  | — |  |  |  | (12,000 | ) |  |  | — |  |  | $ | 5.07 |  |  |  |  |
Exercises |  |  | — |  |  |  | (15,000 | ) |  |  | — |  |  | $ | 4.80 |  |  |  |  |
Outstanding at March 31, 2019 |  |  | 12,500 |  |  |  | 243,000 |  |  |  | 121,500 |  |  | $ | 6.51 |  |  | $ | (59,850 | )
Vested at March 31, 2019 |  |  | 12,500 |  |  |  | 32,500 |  |  |  | — |  |  | $ | 4.93 |  |  | $ | 63,860 |
Vested and expected to vest at |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 31, 2019 |  |  | 12,500 |  |  |  | 243,000 |  |  |  | 121,500 |  |  | $ | 6.51 |  |  | $ | (59,850 | )
Reserved for future grants |  |  | — |  |  |  | 13,000 |  |  |  | 178,500 |  |  |  |  |  |  |  |  |
| (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, 2019 |  |  | 334,000 |  |  | $ | 3.63 |  |  | $ | 6.64 |
Non-vested stock options as of March 31, 2019 |  |  | 332,000 |  |  | $ | 3.65 |  |  | $ | 6.72 |
Stock options granted during the three-month period ended March 31, 2019 |  |  | 10,000 |  |  | $ | 3.16 |  |  | $ | 7.50 |
Stock options that vested during the three-month period ended March 31, 2019 |  |  | — |  |  | $ | — |  |  | $ | — |
Stock options that were forfeited during the three-month period ended March 31, 2019 |  |  | 12,000 |  |  | $ | 2.65 |  |  | $ | 5.07 |
Schedule of fair value stock option grant using black-scholes option valuation model with the weighted-average assumptions |
|  | During the Three-Month Periods Ended March 31, |
|  | 2019 |  |  | 2018 |
Risk-free interest rate |  |  | 2.59 | % |  |  | 2.5 | %
Dividend yield |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 51 | % |  |  | 57 | %
Expected life |  |  | 4 years |  |  |  | 5.1 years |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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