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Note 1 - Description of the Business, Basis of Presentation and Summary of Significant Accounting Policies - 10-Q (Details Textual)
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 25, 2024
USD ($)
$ / shares
shares
Nov. 22, 2024
shares
Oct. 24, 2024
USD ($)
$ / shares
shares
Oct. 17, 2024
Mar. 31, 2025
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
Mar. 31, 2025
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
$ / shares
shares
Feb. 28, 2025
USD ($)
$ / shares
Dec. 31, 2024
$ / shares
Jan. 26, 2024
$ / shares
Dec. 31, 2023
$ / shares
Nov. 29, 2023
$ / shares
shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.001   $ 0.001 $ 0.001   $ 0.001 $ 0.001 $ 0.001       $ 0.001
Common Stock, Shares Authorized (in shares) | shares     500,000,000   500,000,000 500,000,000   500,000,000 500,000,000         500,000,000
Adjustments to Additional Paid in Capital, Stock Split     $ 18,000                      
Stock Issued During Period, Value, New Issues           $ 1,882,000   $ 103,000 $ 2,840,000          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares                         $ 0.02  
Net Income (Loss) Attributable to Parent           (3,337,000) $ (2,699,000) (11,410,000) (15,426,000)          
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation           (2,604,000) (1,852,000) (8,258,000) (6,648,000)          
Revenues           0 0 0 0          
Retained Earnings (Accumulated Deficit)         $ (50,379,000) (53,716,000)   (50,379,000) (38,969,000)          
Working Capital (Deficit)         $ 7,900,000 7,000,000   $ 7,900,000            
Cash           $ 8,600,000                
Property, Plant and Equipment, Useful Life (Year)         3 years 3 years   3 years            
Liability for Uncertainty in Income Taxes, Current         $ 0 $ 0   $ 0 0          
Advertising Expense           $ 0 $ 100,000 $ 100,000 $ 1,800,000          
Number of Reportable Segments           1   1            
Series A Warrants [Member]                            
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares 1                          
Number of Warrants Per Pre-funded Unit (in shares) | shares 1                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 6.54                          
Warrants and Rights Outstanding, Term (Year) 5 years                          
Class of Warrants or Rights, Maximum Beneficial Ownership 4.99%                          
Series A Warrants [Member] | Underwriters [Member]                            
Equity Offering, Option, Maximum Warrants (in shares) | shares   206,422                        
Class of Warrant or Right, Issued During Period (in shares) | shares   156,809                        
Pre-funded Warrants [Member]                            
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares 1                          
Number of Warrants Per Pre-funded Unit (in shares) | shares 1                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 0.001                          
Class of Warrants or Rights, Maximum Beneficial Ownership 4.99%                          
Pre-funded and Series A Warrants [Member]                            
Class of Warrants or Rights, Maximum Beneficial Ownership 4.99%                          
Equity-based Warrants [Member]                            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares                     $ 0.01 $ 125    
Warrants and Rights Outstanding, Term (Year)                       5 years    
ATM Agreement [Member]                            
Equity Offering, Maximum Offering Amount                   $ 2,100,000        
Stock Issued During Period, Shares, New Issues (in shares) | shares         800 1,304,260                
Stock Issued During Period, Value, New Issues           $ 2,100,000                
Proceeds from Issuance or Sale of Equity         $ 1,746                  
Underwritten Public Offering [Member]                            
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.001                          
Number of Common Units Issued (in shares) | shares 458,691                          
Number of Shares Per Common Unit (in shares) | shares 1                          
Number of Warrants Per Common Unit (in shares) | shares 1                          
Number of Pre-funded Units Issued (in shares) | shares 917,596                          
Common Units Issued, Purchase Price (in dollars per share) | $ / shares $ 6.54                          
Pre-funded Units Issued, Purchase Price (in dollars per share) | $ / shares $ 6.539                          
Proceeds from Issuance or Sale of Equity $ 10,000,000                          
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs 1,500,000                          
Proceeds from Issuance or Sale of Equity, Net 9,000,000                          
Underwritten Public Offering [Member] | Non-cash Expenses [Member]                            
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs $ 500,000                          
Over-Allotment Option [Member] | Underwriters [Member]                            
Stock Issued During Period, Shares, New Issues (in shares) | shares   156,809                        
Equity Offering, Option Period (Day)   45 days                        
Equity Offering, Option, Maximum Shares (in shares) | shares   206,422                        
Reverse Stock Split [Member]                            
Stockholders' Equity Note, Stock Split, Conversion Ratio     20                      
Reverse Stock Split [Member] | Minimum [Member]                            
Stockholders' Equity Note, Stock Split, Conversion Ratio       2                    
Reverse Stock Split [Member] | Maximum [Member]                            
Stockholders' Equity Note, Stock Split, Conversion Ratio       50