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5) Stock-based Compensation | 6 Months Ended
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Jun. 30, 2019
Notes |
5) Stock-based Compensation | 5) Stock Compensation Plans The Company has two fixed option plans (the “2013 Plan” and the “2014 Director Plan”). Compensation expense for options issued of $65,037 and $58,053 has been recognized for these plans for the three months ended June 30, 2019 and 2018, respectively, and $129,741 and $116,140 has been recognized for these plans for the six months ended June 30, 2019 and 2018, respectively. As of June 30, 2019, the total unrecognized compensation expense related to the options issued was $108,915, which is expected to be recognized over the vesting period of one year. The fair value of each option granted is estimated on the date of grant using the Black Scholes Option Pricing Model. The Company estimates the expected life of the options using the simplified method. Future volatility is estimated based upon the weighted historical volatility of the Company’s Class A common stock over a period equal to the expected life of the options. The risk-free interest rate for the expected life of the options is based upon the Federal Reserve Board’s daily interest rates in effect at the time of the grant. A summary of the status of the Company’s stock compensation plans as of June 30, 2019, and the changes during the six months ended June 30, 2019, are presented below:
|  | Number of Class A Shares |  | Weighted Average Exercise Price |  | Number of Class C Shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2018 |  | 1,011,274 |  | $ 4.49 |  | 577,280 |  | $ 5.15
Granted |  | 2,000 |  |  |  | - |  |
Exercised |  | (15,328) |  |  |  | - |  |
Cancelled |  | - |  |  |  | - |  |
Outstanding at June 30, 2019 |  | 997,946 |  | $ 4.50 |  | 577,280 |  | $ 5.15
As of June 30, 2019: |  |  |  |  |  |  |  |
Options exercisable |  | 921,895 |  | $ 4.42 |  | 530,030 |  | $ 5.14
As of June 30, 2019: |  |  |  |  |  |  |  |
Available options for future grant |  | 299,351 |  |  |  | 146,425 |  |
Weighted average contractual term of options |  |  |  |  |  |  |  |
outstanding at June 30, 2019 |  | 5.65 years |  |  |  | 3.46 years |  |
Weighted average contractual term of options |  |  |  |  |  |  |  |
exercisable at June 30, 2019 |  | 5.53 years |  |  |  | 2.93 years |  |
Aggregated intrinsic value of options |  |  |  |  |  |  |  |
outstanding at June 30, 2019 (1) |  | $822,875 |  |  |  | $218,010 |  |
Aggregated intrinsic value of options |  |  |  |  |  |  |  |
exercisable at June 30, 2019 (1) |  | $822,875 |  |  |  | $218,010 |  |
(1) The Company used a stock price of $5.02 as of June 30, 2019 to derive intrinsic value.
A summary of the status of the Company’s stock compensation plans as of June 30, 2018, and the changes during the six months ended June 30, 2018, are presented below:
|  | Number of Class A Shares |  | Weighted Average Exercise Price |  | Number of Class C Shares |  | Weighted Average Exercise Price
Outstanding at December 31, 2017 |  | 880,426 |  | $ 4.35 |  | 523,603 |  | $ 5.24
Granted |  | - |  |  |  | - |  |
Exercised |  | (31,984) |  |  |  | - |  |
Cancelled |  | (5,704) |  |  |  | - |  |
Outstanding at June 30, 2018 |  | 842,738 |  | $ 4.48 |  | 523,603 |  | $ 5.24
As of June 30, 2018: |  |  |  |  |  |  |  |
Options exercisable |  | 777,373 |  | $ 4.42 |  | 486,853 |  | $ 5.27
As of June 30, 2018: |  |  |  |  |  |  |  |
Available options for future grant |  | 421,241 |  |  |  | 165,638 |  |
Weighted average contractual term of options |  |  |  |  |  |  |  |
outstanding at June 30, 2018 |  | 6.30 years |  |  |  | 2.94 years |  |
Weighted average contractual term of options |  |  |  |  |  |  |  |
exercisable at June 30, 2018 |  | 6.29 years |  |  |  | 2.45 years |  |
Aggregated intrinsic value of options |  |  |  |  |  |  |  |
outstanding at June 30, 2018 (1) |  | $873,372 |  |  |  | $267,943 |  |
Aggregated intrinsic value of options |  |  |  |  |  |  |  |
exercisable at June 30, 2018 (1) |  | $862,976 |  |  |  | $253,243 |  |
(1) The Company used a stock price of $5.20 as of June 30, 2018 to derive intrinsic value.
The total intrinsic value (which is the amount by which the fair value of the underlying stock exceeds the exercise price of an option on the exercise date) of stock options exercised during the six months June 30, 2019 and 2018 was $15,220 and $111,157, respectively.

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