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Note 4 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  March 31,  Active
Markets
for Identical
Assets
  Significant
Other
Observable
Inputs
  Significant
Unobservable
Inputs
  Amortized 
  

2023

  

(Level 1)

  

(Level 2)

  

(Level 3)

  

Cost

 

Cash equivalents:

                    

Money Market Funds

 $63,450  $63,450  $-  $-  $63,450 
  December 31,  Active
Markets
for Identical
Assets
  Significant
Other
Observable
Inputs
  Significant
Unobservable
Inputs
   Amortized 
  

2022

  

(Level 1)

  

(Level 2)

  

(Level 3)

  

Cost

 

Cash equivalents:

                    

Money Market Funds

 $67,801  $67,801  $-  $-  $67,801