Annual report pursuant to Section 13 and 15(d)

Note 11 - Stock Options and Warrants (Tables)

v3.21.1
Note 11 - Stock Options and Warrants (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
2020
    
2019
  
Risk-free interest rate
    
0.26%
-
0.39%
      
2.31
 %
Dividend yield
    
 
0%
 
      
0
 %
Expected term (in years)
    
 
5
 
      
5
  
Expected volatility
    
65.8%
-
90.3%
      
57.9
 %
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
Options outstanding
            
           
Weighted average
  
Weighted average
  
Aggregate
  
           
exercise price
  
remaining
  
intrinsic
  
Incentive options
  
Shares
    
per share
  
contractual term
  
value
  
Outstanding at December 31, 2018
    
1,376,500
     $
0.23
  
 
    
 
  
Options granted
    
3,000
      
0.21
  
 
    
 
  
Options exercised
    
(10,000
 )    
0.10
  
 
    
 
  
Options expired
    
(15,500
 )    
0.10
  
 
    
 
  
Options forfeited
    
(5,000
 )    
0.46
  
 
    
 
  
Outstanding at December 31, 2019
    
1,349,000
     $
0.23
  
3 years, 11 months
   $
-
  
Options granted
    
235,000
      
0.64
  
 
    
 
  
Options exercised
    
(50,000
 )    
0.20
  
 
    
 
  
Options expired
    
(99,000
 )    
0.18
  
 
    
 
  
Options forfeited
    
(40,000
 )    
0.16
  
 
    
 
  
Outstanding at December 31, 2020
    
1,395,000
     $
0.31
  
4 years, 5 months
   $
1,591,223
  
                           
Exercisable at December 31, 2019
    
1,325,500
     $
0.23
  
3 years, 10 months
   $
-
  
Exercisable at December 31, 2020
    
1,160,000
     $
0.24
  
3 years, 4 months
   $
1,400,423
  
Schedule of Nonvested Share Activity [Table Text Block]
   
Nonvested
  
           
Weighted average
  
           
grant date
  
   
Shares
    
fair value
  
Nonvested at December 31, 2018
    
148,500
     $
0.20
  
Granted
    
3,000
      
0.11
  
Vested
    
(123,000
 )    
0.20
  
Forfeited
    
(5,000
 )    
0.21
  
Nonvested at December 31, 2019
    
23,500
     $
0.17
  
Granted
    
235,000
      
0.36
  
Vested
    
(23,500
 )    
0.17
  
Forfeited
    
-
      
-
  
Nonvested at December 31, 2020
    
235,000
     $
0.36