Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY AND CLASS A PREFERRED STOCK - Stock option activity (Details)

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STOCKHOLDERS' EQUITY AND CLASS A PREFERRED STOCK - Stock option activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Total weighted average intrinsic value      
Outstanding options at - beginning   $ 5,916,970  
Exercised   29,428  
Forfeited   $ 325,539  
Outstanding options - ending     $ 5,916,970
Outstanding options, Weighted average remaining contractual life (years)     6 years 8 months 23 days
Stock Options      
Number of shares      
Outstanding options - beginning 2,142,000 2,294,000  
Exercised (10,000) (18,000)  
Forfeited (27,666) (134,000)  
Outstanding options - ending 2,104,334 2,142,000 2,294,000
Options vested and exercisable at December 31, 2021 1,990,916    
Weighted average exercise price      
Outstanding options - beginning $ 0.80 $ 0.79  
Exercised 0.68 0.69  
Forfeited 1.37 0.72  
Outstanding options - ending 0.79 $ 0.80 $ 0.79
Options vested and exercisable at December 31, 2021 $ 0.76    
Total weighted average intrinsic value      
Outstanding options at - beginning $ 7,934,320    
Outstanding options - ending 9,661,393 $ 7,934,320  
Options vested and exercisable at December 31, 2021 $ 9,207,917    
Outstanding options, Weighted average remaining contractual life (years) 4 years 8 months 4 days 5 years 8 months 19 days  
Options vested and exercisable at December 31, 2021 4 years 6 months 10 days