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Net Loss per Common Share (Schedule of Company's Potential Anti Dilutive Securities) (Details) - shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total shares excluded from calculation 5,150,577 4,531,804
Stock Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total shares excluded from calculation 720,788 154,594
6% Convertible Exchangeable Preferred Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total shares excluded from calculation 85 85
Preferred stock, dividend rate (in percent) 6.00% 6.00%
Series A Convertible Preferred Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total shares excluded from calculation 6,600 6,600
Series B Convertible Preferred Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total shares excluded from calculation 1,188,725 0
Common Stock Warrants [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total shares excluded from calculation 3,234,379 4,370,525