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Note 3 - Equity - 10Q (Details Textual)
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 01, 2025
shares
Nov. 25, 2024
USD ($)
$ / shares
shares
Nov. 22, 2024
shares
Jul. 10, 2024
USD ($)
shares
Apr. 01, 2024
shares
Feb. 15, 2024
USD ($)
$ / shares
shares
Mar. 31, 2025
USD ($)
$ / shares
shares
Aug. 31, 2023
Jun. 30, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2025
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
$ / shares
shares
Feb. 28, 2025
USD ($)
$ / shares
Oct. 24, 2024
$ / shares
shares
Dec. 31, 2023
$ / shares
Nov. 29, 2023
$ / shares
shares
Jun. 30, 2023
shares
Common Stock, Shares Authorized (in shares)             500,000,000   500,000,000     500,000,000 500,000,000   500,000,000   500,000,000  
Preferred Stock, Shares Authorized (in shares)             10,000,000   10,000,000     10,000,000 10,000,000       10,000,000  
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  
Preferred Stock, Shares Outstanding (in shares)             0   0     0 0          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                 5,000     143,303            
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    
Payments of Stock Issuance Costs | $                 $ 64,000   $ (0) $ 176,000 $ (0)          
Class of Warrant or Right, Outstanding (in shares)             25,003   25,003     25,003 25,003          
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares             $ 0.001   $ 0.001     $ 0.001 $ 0.001       $ 0.001  
Series A Warrants [Member]                                    
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)   1                                
Number of Warrants Per Pre-funded Unit (in shares)   1                                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares   $ 6.54                                
Class of Warrants or Rights, Maximum Beneficial Ownership   4.99%                                
Warrants and Rights Outstanding, Term (Year)   5 years                                
Class of Warrant or Right, Fair Value Per Share (in dollars per share) | $ / shares   $ 5.3597                                
Class of Warrant or Right, Outstanding (in shares)                 1,533,096                  
Pre-funded Warrants [Member]                                    
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)   1                                
Number of Warrants Per Pre-funded Unit (in 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%                                
Class of Warrant or Right, Fair Value Per Share (in dollars per share) | $ / shares   $ 6.329                                
Representative's Warrants [Member]                                    
Class of Warrant or Right, Lock-up Period (Day)   180 days                                
Class of Warrant or Right, Fair Value Per Share (in dollars per share) | $ / shares   $ 5.2125                                
Class of Warrant or Right, Outstanding (in shares)                 91,985                  
Common Warrants [Member]                                    
Class of Warrant or Right, Outstanding (in shares)                 87,531                  
RF Innovations, Inc. [Member]                                    
Stock Issued During Period, Shares, New Issues (in shares)       12,500                            
Stock Issued During Period, Value, New Issues | $       $ 100,000                            
Common Stock, Discount for Lack of Marketability       25.60%                            
Maximum Percentage of Shares Sold in Thirty Days       10.00%                            
Underwriters [Member] | Series A Warrants [Member]                                    
Equity Offering, Option, Maximum Warrants (in shares)     206,422                              
Class of Warrant or Right, Issued During Period (in shares)     156,809                              
Underwriters [Member] | Representative's Warrants [Member]                                    
Class of Warrant or Right, Issued During Period (in shares)   91,985                                
Research and Development Expense [Member] | RF Innovations, Inc. [Member]                                    
Share-Based Payment Arrangement, Expense | $                   $ 100,000                
Black-Scholes Model [Member] | Series A Warrants and the Representative's Warrants [Member] | Measurement Input, Discount Rate [Member]                                    
Warrants and Rights Outstanding, Measurement Input                 4.17                  
Black-Scholes Model [Member] | Series A Warrants and the Representative's Warrants [Member] | Measurement Input, Price Volatility [Member]                                    
Warrants and Rights Outstanding, Measurement Input   1.4415             144.15                  
The 2023 Stock Plan [Member]                                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)                                   200,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage of Outstanding Stock Maximum               5.00%                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) 124,852       47,116                          
ATM Agreement [Member]                                    
Equity Offering, Maximum Offering Amount | $                           $ 2,100,000        
Stock Issued During Period, Shares, New Issues (in shares)             800   1,304,260                  
Proceeds from Issuance of Common Stock | $             $ 1,746   $ 2,100,000     $ 2,000 $ 0          
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)   458,691                                
Number of Shares Per Common Unit (in shares)   1                                
Number of Warrants Per Common Unit (in shares)   1                                
Number of Pre-funded Units Issued (in 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                                
Commission Percentage   8.00%                                
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | $   $ 1,500,000                                
Payments of Stock Issuance Costs | $   1,000,000                                
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)     156,809                              
Equity Offering, Option Period (Day)     45 days                              
Equity Offering, Option, Maximum Shares (in shares)     206,422                              
Restricted Stock [Member]                                    
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $             0   0     0            
Share-Based Payment Arrangement, Expense | $                 0   33,250 116,375 16,625          
Restricted Stock [Member] | General and Administrative Expense [Member]                                    
Share-Based Payment Arrangement, Expense | $                 0   33,250 116,375 16,625          
Restricted Stock [Member] | Marketing Consultant [Member]                                    
Stock Issued During Period, Shares, Issued for Services (in shares)           1,750                        
Shares Issued, Price Per Share (in dollars per share) | $ / shares           $ 76                        
Stock Issued During Period, Value, Issued for Services | $           $ 133,000                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month)           12 months                        
Share-Based Payment Arrangement, Option [Member]                                    
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $             4,300,000   3,900,000     4,300,000 3,100,000          
Share-Based Payment Arrangement, Expense | $                       1,500,000 600,000          
Share-Based Payment Arrangement, Option [Member] | General and Administrative Expense [Member]                                    
Share-Based Payment Arrangement, Expense | $                 300,000   300,000 1,300,000 500,000          
Share-Based Payment Arrangement, Option [Member] | Research and Development Expense [Member]                                    
Share-Based Payment Arrangement, Expense | $                 100,000   100,000 200,000 100,000          
Share-Based Payment Arrangement, Option [Member] | Black-Scholes Model [Member]                                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grant Date Fair Value | $             2,600,000   $ 9     $ 2,600,000            
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Discount Rate                 4.06%                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)                 6 years 3 months     6 years 3 months            
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate                 139.00%                  
Share-Based Payment Arrangement, Option [Member] | The 2023 Stock Plan [Member]                                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month)                 4 years     4 years            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                 5,000     143,303            
Warrant [Member]                                    
Share-Based Payment Arrangement, Expense | $                 $ 0   $ 100,000 $ 100,000 100,000          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $             $ 0   $ 0     $ 0 $ 100,000