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Note 7 - Fair Value Measurements (Tables)
 3 Months Ended
Jun. 30, 2025
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

Total Carrying Value

  

Quoted Prices in Active Markets (Level 1)

  

Significant Other Observable Inputs (Level 2)

  

Significant Unobservable Inputs
(Level 3)

 

June 30, 2025:

                

Assets:

                

Cash equivalents

 $175,654  $175,654  $—  $— 

Short-term cash instruments

 $1,401  $—  $1,401  $— 
  Total Carrying Value  Quoted Prices in Active Markets (Level 1)  Significant Other Observable Inputs (Level 2)  Significant Unobservable Inputs (Level 3) 

March 31, 2025

                

Assets:

                

Cash equivalents

 $51,230  $51,230  $—  $— 

Short-term cash instruments

 $1,404  $—  $1,404  $—