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Note 5 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
   

June 30, 2020

   

December 31, 2019

 

(in thousands)

 

Level 1

   

Level 2

   

Level 3

   

Level 1

   

Level 2

   

Level 3

 

Financial Assets:

                                               

Cash and cash equivalents

                                               
Money market mutual fund   $ 26,088     $ -     $ -     $ 68,962     $ -     $ -  

Total

  $ 26,088     $ -     $ -     $ 68,962     $ -     $ -