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Net Loss per Common Share (Schedule of Company's Potential Anti Dilutive Securities) (Details) - shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total shares excluded from calculation 481,167 493,667
Stock Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total shares excluded from calculation 99,957 112,457
6% Convertible Exchangeable Preferred Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total shares excluded from calculation 85 85
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
Common Stock Warrants [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total shares excluded from calculation 374,525 374,525