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Stockholders' Equity (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 12, 2021
Dec. 22, 2020
Dec. 18, 2020
Apr. 24, 2020
Apr. 21, 2020
Jul. 31, 2017
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2017
Class of Stock [Line Items]                    
Common stock, par value (in dollars per share)             $ 0.001   $ 0.001  
Preferred stock, par value (in dollars per share)             $ 0.001   $ 0.001  
Proceeds from further issuance of share             $ 13,502,000      
Common stock, shares outstanding (in shares)             9,234,110   6,246,896  
Underwritten Public Offering [Member]                    
Class of Stock [Line Items]                    
Warrants, exercise price per share             $ 40.00      
Percentage of outstanding common stock             4.99%      
Outstanding common stock at election of purchaser             9.99%      
Warrants outstanding             374,525      
Warrants exercised             0 0    
Offering                    
Class of Stock [Line Items]                    
Common stock, par value (in dollars per share)             $ 0.001      
Option to purchase additional shares period 30 days                  
Proceeds from issuance of common stock, net of issuance costs $ 13,500,000                  
Number of shares issued (in shares) 1,807,143           271,071      
Share Price $ 7.00                  
Common Stock [Member]                    
Class of Stock [Line Items]                    
Proceeds from further issuance of share             $ 2,000      
Number of shares issued (in shares)             2,078,214      
Acorn Bioventures, LP [Member]                    
Class of Stock [Line Items]                    
Warrants to purchase shares             669,854      
Warrant outstanding Term             5 years      
Warrants, exercise price per share             $ 4.13      
Warrants exercised             0      
Number of share sold under the sales agreement     485,912              
Co-Placement Agents [Member]                    
Class of Stock [Line Items]                    
Sell of stock, price per share         $ 5.00          
Proceeds from issuance of stocks/warrants       $ 18,300,000            
Number of common shares called by each warrant             1      
Warrants, exercise price per share             $ 5.00      
Warrant to purchase each share of our common stock             1      
Warrants outstanding             2,190,000      
Warrants exercised             909,000      
Co-Placement Agents [Member] | Pre Funded Warrants [Member]                    
Class of Stock [Line Items]                    
Sell of stock, price per share         $ 4.999          
Number of common shares called by each warrant         1          
Warrants, exercise price per share         $ 0.001          
Warrant to purchase each share of our common stock         1          
Percentage of outstanding common stock         4.99%          
Outstanding common stock at election of purchaser         9.99%          
Shares issued on conversion of prefunded warrants       2,090,000            
Number of share sold under the sales agreement         2,090,000          
Co-Placement Agents [Member] | Common Stock Warrants [Member]                    
Class of Stock [Line Items]                    
Warrants to purchase shares         4,000,000          
Warrant outstanding Term         5 years          
Number of common shares called by each warrant         1          
Warrants, exercise price per share         $ 5.00          
Warrant to purchase each share of our common stock         1          
Percentage of outstanding common stock             4.99%      
Outstanding common stock at election of purchaser             9.99%      
Notice period from the holder to increase the percentage of ownership of outstanding common stock after exercise of warrants             61 days      
Fractional shares issued             0      
Common Stock [Member] | Co-Placement Agents [Member]                    
Class of Stock [Line Items]                    
Number of shares issued (in shares)         1,910,000          
6% Convertible Exchangeable Preferred Stock [Member]                    
Class of Stock [Line Items]                    
Preferred stock, shares issued             335,273   335,273  
Preferred stock, shares outstanding             335,273   335,273  
Share issue price per share             $ 10.00      
Dividend rate on convertible exchangeable preferred stock (in percent)             6.00%   6.00%  
Liquidation preference (in dollars per share)             $ 10.00      
Convertible preferred stock, terms of conversion             The Company may automatically convert the 6% Preferred Stock into common stock if the per share closing price of the Company's common stock has exceeded $59,220, which is 150% of the conversion price of the 6% Preferred Stock, for at least 20 trading days during any 30 day trading period, ending within five trading days prior to notice of automatic conversion.      
Interest rate of Convertible Subordinated Debentures (as a percent)             6.00%      
Accrued and unpaid dividends             $ 50,291      
Redemption price per share (in dollars per share)             $ 10.00      
Debt principal amount per share, basis for exchange (in dollars per share)             $ 10.00      
Debt instrument, term             25 years      
Series A Convertible Preferred Stock [Member]                    
Class of Stock [Line Items]                    
Preferred stock, par value (in dollars per share)             $ 0.001   $ 0.001  
Preferred stock, shares issued           8,872 264   264  
Preferred stock, shares outstanding             264   264  
Number of common shares issued upon conversion           215,200        
Number of shares converted             6,600     8,608
Price per share used to determine number of shares of common stock           $ 1,000        
Conversion price of convertible preferred stock           $ 40.00        
Conversion percentage           9.99%        
Measurement period of consecutive trading days used in determining whether specified triggers are met which would allow the entity to require the conversion of all or part of outstanding preferred stock             30 days      
Percentage of blocker provision           4.99%        
Series A Convertible Preferred Stock [Member] | Minimum [Member]                    
Class of Stock [Line Items]                    
Percentage by which the weighted average price of common stock during the measurement period exceeds the initial conversion price which triggers the right of the entity to cause all or part of the outstanding preferred stock to be converted             300.00%      
Threshold amount of daily trading volume on each trading day during the measurement period which triggers the right of the entity to cause all or part of the outstanding preferred stock to be converted             $ 500,000      
Series B Convertible Preferred Stock [Member]                    
Class of Stock [Line Items]                    
Preferred stock, par value (in dollars per share)             $ 0.001   $ 0.001  
Preferred stock, shares issued             237,745   237,745  
Preferred stock, shares outstanding             237,745   237,745  
Sell of stock, price per share             $ 4.18      
Effective Conversion price per share             $ 3.18      
Number of common shares issued upon conversion             5      
Series B Convertible Preferred Stock [Member] | Acorn Bioventures, LP [Member]                    
Class of Stock [Line Items]                    
Warrants to purchase shares     669,854              
Sell of stock, price per share     $ 4.18              
Warrants exercisable date     Dec. 18, 2021              
Warrant outstanding Term     5 years              
Proceeds from issuance of stocks/warrants   $ 6,900,000                
Number of common shares called by each warrant     0.4              
Warrants, exercise price per share     $ 4.13              
Warrant to purchase each share of our common stock     0.4              
Number of share sold under the sales agreement     237,745