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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Schedule of activity under the stock option plans

   2010 Plan   2017 Plan   Weighted
Average
Exercise Price		  

Aggregate
Intrinsic
Value(1)

 
Outstanding as of December 31, 2019   255,000    133,500   $6.48   $(516,475)
Grants   7,000    93,000   $5.03      
Terminations/forfeitures   (12,000)   (50,000)  $5.45      
Exercises   (12,500)   —   $3.15      
Outstanding as of December 31, 2020   237,500    176,500   $6.38   $(180,038)
Grants   —    6,000   $7.39      
Terminations/forfeitures   (7,000)   (2,000)  $6.17      
Exercises   (2,000)   —   $5.84      
Outstanding as of March 31, 2021   228,500    180,500   $6.41   $1,322,325 
Vested as of March 31, 2021   188,500    98,500   $6.75   $828,850 
Vested and expected to vest as of March 31, 2021   228,500    180,500   $6.41   $1,322,325 
Reserved for future grants   —    119,500           

 

(1)Intrinsic value is the difference between the fair market value of the underlying common stock 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 December 31, 2020   248,000   $3.25   $6.44 
Non-vested stock options as of March 31, 2021   122,000   $2.84   $6.69 
Stock options granted during the three-month period ended March 31, 2021   6,000   $3.77   $7.39 
Stock options that vested during the three-month period ended March 31, 2021   123,000   $3.68   $7.34 
Stock options that were forfeited during the three-month period ended March 31, 2021   9,000   $3.29   $6.17 
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,		 
   2021   2020 
Risk-free interest rate   0.43%   0.78%
Dividend yield   0%   0%
Expected volatility   53%   52%
Expected life   6.5 years    6.5 years