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Stockholders' Equity (Tables)
9 Months Ended
Sep. 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 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    83,000   $4.88      
Terminations       (12,000)   (46,000)  $5.40      
Exercises              $      
Outstanding as of September 30, 2020     250,000    170,500   $6.29   $(360,558)
Vested as of September 30, 2020     165,500    10,000   $6.04   $(106,700)
Vested and expected to vest as of                         
    September 30, 2020       250,000    170,500   $6.29   $(360,558)
Reserved for future grants           129,500           

 

(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 September 30, 2020   245,000   $3.28   $6.47 
Stock options granted during the nine-month period ended September 30, 2020   90,000   $2.39   $4.88 
Stock options that vested during the nine-month period ended September 30, 2020   110,000   $3.44   $5.99 
Stock options that were forfeited during the nine-month period ended September 30, 2020   58,000   $2.80   $5.40 
Schedule of fair value stock option grant using black-scholes option valuation model with the weighted-average assumptions
   During the Three-Month Period Ended September 30,
2020
   During the Three-Month Period Ended September 30,
2019
   During the Nine-Month Period Ended September 30,
2020
   During the Nine-Month Period Ended September 30,
2019
 
Risk-free interest rate   0.30%   n/a    0.41%   2.20%
Dividend yield   0%   0%   0%   0%
Expected volatility   54%   n/a    53%   52%
Expected life   6.5 years    n/a    6.1 years    5.3 years