Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Schedule of Warrant activities) (Details)

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Stockholders' Equity (Schedule of Warrant activities) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Equity [Abstract]    
Outstanding warrants 4,530,621 4,590,621
Warrants forfeited, Number of shares (60,000)  
Warrants exercisable, Number of shares 4,370,621  
Warrants outstanding, Weighted average exercise price $ 3.20 $ 3.17
Warrants forfeited, Weighted average exercise price 1.37  
Warrants exercisable, Weighted average exercise price $ 3.23  
Warrants outstanding, Weighted average intrinsic value $ 1,820,564 $ 607,848
Warrants forfeited, Weighted average intrinsic value 0  
Warrants exercisable, Weighted average intrinsic value $ 1,607,964  
Warrants, Weighted average remaining contractual life 4 years 7 months 28 days 4 years 10 months 6 days
Warrants exercisable, Weighted average remaining contractual life 4 years 7 months 9 days