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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 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 at December 31, 2018   12,500    270,00    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   —    4,000    18,000   $4.17      
Terminations   —    (4,000)   —   $5.88      
Exercises   —    —    —   $—      
Outstanding at March 31, 2020   —    255,000    151,500   $6.36   $(1,044,945)
Vested at March 31, 2020   —    159,500    10,000   $6.05   $(383,270)
Vested and expected to vest at March 31, 2020   —    255,000    151,500   $6.36   $(1,044,945)
Reserved for future grants   —    1,000    148,500           

 

(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 March 31, 2020   237,000   $3.39   $6.58 
Stock options granted during the three-month period ended March 31, 2020   22,000   $2.12   $4.17 
Stock options that vested during the three-month period ended March 31, 2020   102,000   $3.44   $6.00 
Stock options that were forfeited during the three-month period ended March 31, 2020   4,000   $3.08   $5.88 
Schedule of fair value stock option grant using black-scholes option valuation model with the weighted-average assumptions
   During the Three-Month Period
Ended March 31, 2020		   During the Three-Month Period
Ended March 31, 2019		 
Risk-free interest rate   0.78%   2.59%
Dividend yield   0%   0%
Expected volatility   52%   51%
Expected life   6.5 years    4 years