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Note 8 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]
   

September 30, 2022

 
   

Level 1

   

Level 2

   

Level 3

   

Total Fair Value

 

Cash equivalents

                               

Money market funds

  $ 23,980,000     $     $     $ 23,980,000  

Marketable securities

                               

Corporate debt securities

    983,000                   983,000  

Total assets

  $ 24,963,000     $     $     $ 24,963,000