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Note 7 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
  

December 31, 2022

  

December 31, 2021

 

(in thousands)

 

Level 1

  

Level 2

  

Level 3

  

Level 1

  

Level 2

  

Level 3

 
                         

Financial Assets:

                        

Cash and cash equivalents, excluding money market mutual fund

 $38,862  $-  $-  $65,637  $-  $- 

Money market mutual fund

  17,696   -   -   292   -   - 

Marketable securities

  9,881   40,106   -   7,602   18,318   - 

Total

 $66,439  $40,106  $-  $73,531  $18,318  $-