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Note 4 - Equity (Tables)
3 Months Ended 12 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Notes Tables    
Restricted Stock Expenses, General and Administrative [Table Text Block]
  

Three Months Ended June 30,

 
  

2025

  

2024

 

Recognized in general and administrative expense

 $  $33,250 
         

Total

 $  $33,250 
  

Year ended March 31,

 
  

2025

  

2024

 

Recognized in general and administrative expense

 $116,375  $16,625 
         

Total

 $116,375  $16,625 
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]  
      

Grant Date

 
  

Number of

Shares

  

Fair Value Per

Share

 

Outstanding, March 31, 2024

  1,604  $76.00 
         

Granted

    $ 

Vested

  (1,604) $76.00 

Outstanding, March 31, 2025

    $ 
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
      

Weighted-

Average

 
      

Exercise Price

 
  

Options

  

Per Share

 
         

Outstanding, March 31, 2025

  243,483  $32.72 

Granted

  5,000   1.85 

Exercised

  -   - 

Forfeited/Cancelled

  -   - 

Expired

  -   - 

Outstanding, June 30, 2025

  248,483  $32.10 
         

Exercisable, June 30, 2025

  69,916  $37.24 
  

Options

  

Weighted-

Average

Exercise

Price

Per Share

  

Weighted-

Average

Remaining

Life

(In Years)

  

Aggregate

Intrinsic

Value*

 
                 

Outstanding, March 31, 2024

  100,180  $46.59   9.35  $1,680,672 

Granted

  143,303   23.02       

Exercised

            

Forfeited/Cancelled

            

Expired

            

Outstanding, March 31, 2025

  243,483  $32.72   8.92  $- 
                 

Exercisable, March 31, 2025*

  37,923  $44.35   8.20  $- 
Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option [Table Text Block]
      

Weighted-

Average

 
      

Exercise Price

 
  

Warrants

  

Per Share

 
         

Outstanding, March 31, 2025

  1,934,874  $5.8860 

Granted

  -   - 

Exercised

  (222,132)  0.0010 

Forfeited/Cancelled

  (130)  0.0010 

Expired

  -   - 

Outstanding, June 30, 2025*

  1,712,612  $6.6498 
         

Exercisable, June 30, 2025

  1,712,612  $6.6498 
  

Warrants

  

Weighted-

Average

Exercise

Price Per

Share

  

Weighted-

Average

Remaining

Life (In

Years)

  

Aggregate

Intrinsic

Value*

 
                 

Outstanding and exercisable, March 31, 2024

  287,231  $1.64   4.80  $17,072,147 

Granted

  2,542,677   4.31       

Exercised**

  (892,432)  0.04       

Forfeited/Cancelled

  (2,602)  0.20       

Expired

            

Outstanding, March 31, 2025

  1,934,874  $5.89   4.09  $532,060 
                 

Exercisable, March 31, 2025

  1,842,889  $5.67   4.06  $532,060 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]  
  

Range

 
  

2025

  

2024

 

Fair value of common stock on the measurement date (per share)

    $2.00to5.00 

Discount rate based on the daily yield curve rates for U.S. Treasury obligations

    4.04%to4.54% 

Expected life (in years)

    3to5 

Expected volatility based on the historical volatility of comparable companies' stock

    104%to119%