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Note 1 - Background and Significant Accounting Policies (Details Textual)
3 Months Ended 6 Months Ended
Sep. 26, 2024
USD ($)
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
shares
Mar. 31, 2024
USD ($)
shares
Mar. 09, 2023
shares
Mar. 08, 2023
shares
Aug. 15, 2019
shares
Aug. 14, 2019
shares
Apr. 08, 2018
shares
Mar. 31, 2018
shares
Common Stock, Shares Authorized (in shares) | shares   950,000,000   950,000,000   950,000,000 950,000,000 600,000,000 600,000,000 400,000,000 400,000,000 250,000,000
Deferred Tax Liabilities, Deferred Expense, Capitalized Patent Costs           $ 42,194            
Amortization of Intangible Assets   $ 0 $ 624                  
Indefinite-Lived Intangible Assets (Excluding Goodwill)   $ 0 0 $ 0 $ 0              
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares       177,877,867 183,656,554              
EndoPure [Member]                        
Royalty Rates 5.00%                      
Prepaid Annual Royalty $ 50,000                      
Royalty Agreement, Initial Payment 125,000                      
Monthly Consulting Fee $ 5,000                      
Patents [Member] | UNITED STATES                        
Finite-Lived Intangible Assets, Number   8   8                
Patents [Member] | UNITED STATES | Subsidiaries [Member]                        
Finite-Lived Intangible Assets, Number   8   8                
Patents [Member] | Non-US [Member]                        
Finite-Lived Intangible Assets, Number   12   12                
Patents [Member] | Non-US [Member] | Subsidiaries [Member]                        
Finite-Lived Intangible Assets, Number   12   12                
Patents Allowed [Member] | Non-US [Member]                        
Finite-Lived Intangible Assets, Number   2   2                
Patents Allowed [Member] | Non-US [Member] | Subsidiaries [Member]                        
Finite-Lived Intangible Assets, Number   2   2                
Patents Pending [Member]                        
Indefinite-Lived Intangible Assets (Excluding Goodwill)     $ 0   $ 0              
Patents Pending [Member] | UNITED STATES                        
Indefinite-Lived Intangible Assets, Pending, Number   15 10 15 10              
Patents Pending [Member] | UNITED STATES | Subsidiaries [Member]                        
Finite-Lived Intangible Assets, Number   15   15                
Patents Pending [Member] | Non-US [Member]                        
Indefinite-Lived Intangible Assets, Pending, Number   41 35 41 35              
Patents Pending [Member] | Non-US [Member] | Subsidiaries [Member]                        
Finite-Lived Intangible Assets, Number   41   41