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Note 1 - Description of the Business, Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Anti-dilutive Securities - 10Q (Details) - shares
3 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2025
Mar. 31, 2024
Antidilutive securities (in shares) 1,986,098 279,070 1,981,098 162,767
Warrant [Member]        
Antidilutive securities (in shares) 87,531 4,334 87,531 4,334
Convertible Debt Securities [Member]        
Antidilutive securities (in shares) [1] 0 33,250 0 33,250
Convertible Notes to Warrant [Member]        
Antidilutive securities (in shares) 25,003 25,003 25,003 25,003
Share-Based Payment Arrangement, Option [Member]        
Antidilutive securities (in shares) 248,483 216,483 243,483 100,180
Series A Warrants [Member]        
Antidilutive securities (in shares) 1,533,096 0 1,533,096 0
Representative's Warrants [Member]        
Antidilutive securities (in shares) 91,985 0 91,985 0
[1] Shares for the convertible note proceeds received