Annual report pursuant to Section 13 and 15(d)

COMMON STOCK OPTIONS AND WARRANTS (Schedule of activity of warrants) (Details)

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COMMON STOCK OPTIONS AND WARRANTS (Schedule of activity of warrants) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Warrants      
Outstanding at end of period 451,898    
Warrant [Member]      
Number of Warrants      
Outstanding at the beginning of the year 1,521,250 1,815,181  
Warrants expired, forfeited, cancelled or exercised (23,116) (338,575)  
Warrants issued 89,419 44,644  
Outstanding at end of period 1,587,333 1,521,250 1,815,181
Exercisable at end of period 1,587,333 1,521,250  
Weighted Average Exercise Price      
Outstanding at the beginning of the year $ 8.78 $ 9.52  
Warrants issued 9.02 7.70  
Outstanding at end of period 8.62 8.78 $ 9.52
Exercisable at end of period $ 8.69 $ 8.78  
Remaining Average Remaining Contractual Term (Years)      
Outstanding at the beginning of the year 3 years 10 months 25 days 3 years 10 months 25 days  
Warrant issued 2 years 2 months 12 days 4 years 10 months 25 days  
Outstanding at end of period 2 years 3 years 10 months 25 days  
Exercisable at end of period 2 years 3 years 10 months 25 days  
Aggregate Intrinsic Value      
Outstanding
Exercisable