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 ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Equity [Abstract]    
Outstanding warrants 4,505,621 4,590,621
Warrants forfeited, Number of shares (25,000)  
Warrants expired, 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 3.00  
Warrants expired, Weighted average exercise price 1.37  
Warrants exercisable, Weighted average exercise price $ 3.23  
Warrants outstanding, Weighted average intrinsic value $ 1,958,891 $ 607,848
Warrants expired, Weighted average intrinsic value 0  
Warrants forfeited, Weighted average intrinsic value 0  
Warrants exercisable, Weighted average intrinsic value $ 1,754,141  
Warrants, Weighted average remaining contractual life 4 years 5 months 8 days 4 years 10 months 6 days
Warrants exercisable, Weighted average remaining contractual life 4 years 4 months 9 days