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10. SHAREHOLDERS' EQUITY (Tables)
3 Months Ended
Mar. 31, 2021
Stockholders' Equity:  
Stock Options Outstanding
    March 31, 2021        
    (Unaudited)     December 31, 2020  
    Number of Options     Weighted Average Exercise Price     Number of Options     Weighted Average Exercise Price  
Outstanding, beginning of period     132,500     $ 2.72       77,500     $ 2.56  
Granted     -       -       62,500       3.96  
Exercised     -       -       (2,500 )     0.40  
Expired     -       -       (5,000 )     16.80  
Outstanding, end of period     132,500     $ 2.72       132,500     $ 2.72  
Options Outstanding and Exercisable by Price Range
  Outstanding Options    

Average

Weighted

    Exercisable Options  
  Range     Number    

Remaining

Contractual

Life in Years

    Number    

Weighted

Average

Exercise Price

 
  $ 0.80       27,500       3.85       27,500     $ 0.80  
  $ 0.88       31,250       2.76       31,250     $ 0.88  
  $ 0.96       25,000       2.77       25,000     $ 0.96  
  $ 2.16       5,000       3.76       5,000     $ 2.16  
  $ 4.40       12,500       4.85       12,500     $ 4.40  
  $ 7.06       31,250       4.50       31,250     $ 7.06  
                                       
            132,500       3.64       132,500     $ 2.72  
Stock Warrants Outstanding
   

March 31, 2021

(Unaudited)

    December 31, 2020  
    Number of Warrants     Weighted Average Exercise Price     Number of Warrants     Weighted Average Exercise Price  
Outstanding, beginning of period     2,049,133     $ 2.55       2,155,065     $ 3.12  
Granted     -       -       585,447       4.97  
Exercised     -       -       (76,796 )     (2.77 )
Expired     (168,750 )     (2.84 )     (614,583 )     (6.40 )
Outstanding, end of period     1,880,383     $ 2.66       2,049,133     $ 2.55  
Warrants Outstanding and Exercisable by Price Range
  Outstanding Warrants           Exercisable Warrants  
  Exercise Price     Number    

Average Weighted

Remaining Contractual

Life in Years

    Number    

Weighted Average

Exercise Price

 
  $ 0.64       31,250       2.65       31,250     $ 0.64  
  $ 0.80       158,125       2.51       158,125     $ 0.80  
  $ 0.96       473,958       1.69       473,958     $ 0.96  
  $ 1.12       6,250       3.05       6,250     $ 1.12  
  $ 1.20       175,000       3.63       175,000     $ 1.20  
  $ 1.36       1,250       1.57       1,250     $ 1.36  
  $ 2.16       31,250       0.75       31,250     $ 2.16  
  $ 2.32       523,061       0.91       523,061     $ 2.32  
  $ 2.40       12,500       0.50       12,500     $ 2.40  
  $ 2.56       31,250       0.50       31,250     $ 2.56  
  $ 3.36       31,250       0.25       31,250     $ 3.36  
  $ 4.00       28,750       4.35       28,750     $ 4.00  
  $ 6.95       375,000       9.50       375,000     $ 6.95  
  $ 8.40       1,488       2.38       1,488     $ 8.40  
            1,880,383       3.35       1,880,383     $ 2.66