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Note 5 - Stock-based Compensation; Changes in Equity (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 12 Months Ended
Jun. 05, 2020
Apr. 13, 2020
Apr. 01, 2020
Feb. 28, 2021
Jan. 31, 2021
Nov. 30, 2020
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Jun. 30, 2020
Dec. 31, 2020
Stock Issued During Period, Value, New Issues               $ 3,626,600      
Adjustments to Additional Paid in Capital, Preferred Stock with Beneficial Conversion Feature             $ 1,500,000        
Stock Issued During Period, Shares, Warrants Exercised (in shares)                     391,308
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)                     5 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate                     0.00%
Minimum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                     0.42%
Maximum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                     1.65%
Series A Preferred Stock [Member]                      
Proceeds from Issuance of Preferred Stock and Preference Stock             3,626,600      
Stock Issued During Period, Value, New Issues             1,000,000        
Preferred Stock Redemption Premium $ 2,500,000                    
Preferred Stock, Dividend Rate, Percentage 8.00%                    
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share) $ 10                    
Dividends, Total             100,000 $ 52,741      
Preferred Stock, Value, Issued, Ending Balance             2,854,583   $ 2,854,583   $ 2,754,583
Series A Preferred Stock [Member] | Conversion of Accounts Receivable Owed to Investor to Preferred Stock [Member]                      
Debt Conversion, Original Debt, Amount     $ 478,000                
Debt Conversion, Converted Instrument, Shares Issued (in shares)     48,200                
Series B Preferred Stock [Member]                      
Proceeds from Issuance of Preferred Stock and Preference Stock           $ 1,500,000          
Stock Issued During Period, Value, New Issues             1,612,707        
Stock Issued During Period, Shares, New Issues (in shares)           170,000          
Preferred Stock, Dividend Rate, Percentage           8.00%          
Preferred Stock, Par or Stated Value Per Share (in dollars per share)           $ 10          
Preferred Stock, Convertible, Conversion Price (in dollars per share)           $ 1          
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests, Ending Balance           $ 1,500,000     1,532,164
Preferred Stock, Value, Issued, Ending Balance           $ 1,500,000 1,612,707   1,612,707  
Dividends Payable             47,206   47,206    
Preferred Stock, Accretion of Redemption Discount             46,937   65,500    
Series C Preferred Stock [Member]                      
Proceeds from Issuance of Preferred Stock and Preference Stock         $ 1,500,000            
Stock Issued During Period, Value, New Issues             1,500,000        
Stock Issued During Period, Shares, New Issues (in shares)         170,000            
Preferred Stock, Dividend Rate, Percentage         8.00%            
Preferred Stock, Par or Stated Value Per Share (in dollars per share)         $ 10            
Preferred Stock, Convertible, Conversion Price (in dollars per share)         $ 1            
Preferred Stock, Value, Issued, Ending Balance             1,528,333   $ 1,528,333  
Adjustments to Additional Paid in Capital, Preferred Stock with Beneficial Conversion Feature             $ 1,500,000        
Series A Preferred Stock Warrants [Member]                      
Class of Warrant or Right, Granted in Period (in shares)                     792,660
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                     792,660
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                     $ 1
Class of Warrant or Right, Exercised During Period (in shares)       195,160 195,160           597,500
Stock Issued During Period, Shares, Warrants Exercised (in shares)       103,104 103,104            
Purchase Agreement [Member] | Series A Preferred Stock [Member]                      
Sale of Stock, Shares Agreed to Purchase (in shares)   500,000                  
Second Purchase Agreement Amendment [Member] | Series A Preferred Stock [Member]                      
Shares Issued, Price Per Share (in dollars per share)   $ 10                  
Proceeds from Issuance of Preferred Stock and Preference Stock   $ 5,000,000                  
Second Purchase Agreement Amendment [Member] | Series A Preferred Stock [Member] | Conversion from Each Share Series A Preferred Stock to Common Stock [Member]                      
Conversion of Stock, Shares Converted (in shares)   10                  
Additional Offering [Member] | Series A Preferred Stock [Member]                      
Sale of Stock, Contingent Additional Offered Shares (in shares)   200,000                  
Additional Shares Offering [Member] | Series A Preferred Stock [Member]                      
Sale of Stock, Price Per Share (in dollars per share)   $ 10                  
Equity Financing Arrangement [Member] | Common Stock [Member]                      
Stock Issued During Period, Shares, New Issues (in shares)                   400,000