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Note 3 - Convertible Notes Payable (Tables)
3 Months Ended 12 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Notes Tables    
Convertible Debt [Table Text Block]  
  

Principal Amount

  

Amortized Debt

Discount

  

Net Carrying

Amount

 
             

Outstanding, March 31, 2024

 $1,330  $(328) $1,002 

Amortization of debt discount

     175   175 

Issuance of common stock for extinguishment of convertible debt

  (1,330)  153   (1,177)

Outstanding, March 31, 2025

 $  $  $ 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
      

Weighted-

Average

 
      

Exercise Price

 
  

Warrants

  

Per Share

 
         

Outstanding and exercisable, March 31, 2025

  25,003  $20.00 

Granted

  -   - 

Exercised

  -   - 

Forfeited/Cancelled

  -   - 

Expired

  -   - 

Outstanding, June 30, 2025

  25,003  $20.00 
         

Exercisable, June 30, 2025

  25,003  $20.00 
  

Warrants

  

Weighted-

Average

Exercise

Price Per

Share

  

Remaining

Life (In

Years)

  

Aggregate

Intrinsic

Value*

 
                 

Outstanding and exercisable, March 31, 2024

  25,003  $20.00   4.48  $1,010,000 

Granted

            

Exercised

            

Forfeited/Cancelled

            

Expired

            

Outstanding, March 31, 2025

  25,003  $20.00   3.48  $ 
                 

Exercisable, March 31, 2025

  25,003  $20.00   3.48  $