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Stockholders' Equity (Information About Outstanding Warrants) (Details) - Warrant [Member]
 12 Months Ended
Dec. 31, 2020
$ / shares
shares
Number of warrant shares  
Outstanding at beginning (in shares) | shares 1,662,304
Exercised (in shares) | shares (713,449)
Outstanding at ending (in shares) | shares 948,855
Exercisable (in shares) | shares 948,855
Weighted average exercise price  
Outstanding at beginning (in dollars per share) | $ / shares $ 3.25
Exercised (in dollars per share) | $ / shares 3.25
Outstanding at ending (in dollars per share) | $ / shares 3.25
Exercisable (in dollars per share) | $ / shares $ 3.25