v3.26.3
Note 5 - Stockholders' Equity (Details Textual)
 3 Months Ended 12 Months Ended 228 Months Ended
Aug. 03, 2025
USD ($)
Mar. 10, 2025
USD ($)
$ / shares
shares
Nov. 16, 2023
shares
Jul. 31, 2026
USD ($)
$ / shares
shares
Jul. 31, 2025
USD ($)
Apr. 30, 2026
USD ($)
$ / shares
shares
Jul. 31, 2026
USD ($)
$ / shares
shares
Jan. 31, 2026
Aug. 31, 2025
USD ($)
Jul. 09, 2025
$ / shares
May 28, 2025
$ / shares
Nov. 30, 2023
USD ($)
Nov. 17, 2023
USD ($)
Nov. 09, 2023
USD ($)
Sep. 30, 2023
USD ($)
Sep. 28, 2023
USD ($)
Preferred Stock, Shares Authorized (in shares)       20,000,000     20,000,000                  
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares       $ 0.001     $ 0.001     $ 0.001            
Common Stock, Shares Authorized (in shares)       500,000,000   500,000,000 500,000,000                  
Common Stock, Shares, Issued (in shares)       3,904,983   3,188,380 3,904,983                  
Proceeds from Issuance of Common Stock | $       $ 10,233 $ 0                      
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares       $ 0   $ 0                    
Common Stock, Shares, Outstanding (in shares)       3,904,983   3,188,380 3,904,983                  
Restricted Stock [Member]                                
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)       425,000                        
Restricted Stock Units (RSUs) [Member]                                
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)       101,250                        
Conversion of Debt and Interest into Common Stock [Member]                                
Debt Conversion, Original Debt, Interest | $       $ 164,000                        
Debt Conversion, Converted Instrument, Shares Issued (in shares)     36,563 78,103                        
Conversion of Series D Preferred into Common Stock [Member]                                
Conversion of Stock, Shares Converted (in shares)             1,487,119                  
Conversion of Stock, Shares Issued (in shares)       107,330     1,487,119                  
Common Stock Warrants [Member]                                
Warrants and Rights Outstanding, Term (Year)               5 years                
Common Stock Warrants [Member] | Maximum [Member]                                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares       $ 425   $ 425 $ 425                  
Unit Offering [Member]                                
Units Authorized (in shares)   4,285,714                            
Common Stock, Number in One Unit (in shares)   1                            
Unit Offering Price (in dollars per share) | $ / shares   $ 3.5                            
Units Authorized, Value | $   $ 15,000,000                            
Units, Cash Fee, Percent   7.00%                            
Units, Percent Awarded   3.00%                            
Units, Issued During Period (in shares)       0   1,912,383                    
Proceeds from Issuance of Units | $           $ 6,700,000                    
Unit Offering [Member] | Unit Warrants [Member]                                
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)   1                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   4,285,714                            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares   $ 5                            
Unit Offering [Member] | Agent Unit Warrants [Member]                                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares   $ 4.375                            
Class of Warrant or Right, Number in One Unit (in shares)   1                            
ATM Offering [Member]                                
Stock Issued During Period, Shares, New Issues (in shares)       4,920                        
Sale of Stock, Value, Authorized | $ $ 25,000,000               $ 25,000,000     $ 15,000,000 $ 15,000,000 $ 10,000,000 $ 3,250,000  
Common Stock, Value, Authorized | $                               $ 50,000,000
Commission Rate 4.00%                              
Proceeds from Issuance of Common Stock | $       $ 10,000                        
Percent of Gross Sales Price 3.00%                              
ATM Offering [Member] | Maximum [Member]                                
Proceeds from Issuance of Common Stock | $ $ 11,036,310                              
Series A Preferred Stock [Member]                                
Preferred Stock, Shares Designated (in shares)       10,000     10,000                  
Series B Preferred Stock [Member]                                
Preferred Stock, Shares Designated (in shares)       10,000     10,000                  
Series C Preferred Stock [Member]                                
Preferred Stock, Shares Authorized (in shares)       20,000,000   20,000,000 20,000,000                  
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares       $ 0.001   $ 0.001 $ 0.001                  
Preferred Stock, Shares Designated (in shares)       600,000   600,000 600,000                  
Share Price (in dollars per share) | $ / shares       $ 25     $ 25                  
Preferred Stock, Shares Outstanding (in shares)       380,440   380,440 380,440                  
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share) | $ / shares       $ 1.5                        
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ / shares       $ 0                        
Preferred Stock, Convertible, Shares Issuable (in shares)       295,141     295,141                  
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares       $ 32.22     $ 32.22                  
Series C Preferred Stock [Member] | FRV [Member]                                
Investment Owned, Balance, Shares (in shares)       71,000     71,000                  
Series D Preferred Stock [Member]                                
Preferred Stock, Shares Authorized (in shares)       20,000,000   20,000,000 20,000,000                  
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares       $ 0.001   $ 0.001 $ 0.001       $ 3.5          
Preferred Stock, Shares Designated (in shares)       4,285,714   4,285,714 4,285,714                  
Preferred Stock, Shares Outstanding (in shares)       425,264   532,594 425,264                  
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ / shares       $ 0                        
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares       $ 3.5     $ 3.5                  
Preferred Stock, Convertible, Conversion Ratio       1     1                  
Preferred Stock, Convertible, Maximum Common Stock Closing Price (in dollars per share) | $ / shares       $ 5     $ 5                  
Gross Proceeds of Public Offering | $       $ 15,000,000     $ 15,000,000                  
Series D Preferred Stock [Member] | Unit Offering [Member]                                
Preferred Stock, Number in One Unit (in shares)   1                            
Stock Issued During Period, Shares, New Issues (in shares)   4,285,714