Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Cash, Cash Equivalents and Investments - Cash Equivalents and Investments Carried at Fair Value (Details)

v3.22.2.2
Note 5 - Cash, Cash Equivalents and Investments - Cash Equivalents and Investments Carried at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Fair value $ 21,400  
Total 46,583 $ 56,885
Fair Value, Inputs, Level 1 [Member]    
Total 28,751 56,885
Fair Value, Inputs, Level 2 [Member]    
Total 17,832 0
Fair Value, Inputs, Level 3 [Member]    
Total 0 0
Money Market Funds [Member]    
Money market funds, included in cash equivalents 25,183 56,885
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Money market funds, included in cash equivalents 25,183 56,885
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]    
Money market funds, included in cash equivalents 0 0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]    
Money market funds, included in cash equivalents 0 $ 0
US Treasury Securities [Member]    
Fair value 2,674  
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value 2,674  
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value 0  
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value 0  
Debt Security, Government, Non-US [Member]    
Fair value 894  
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value 894  
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value 0  
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value 0  
Asset-Backed Securities [Member]    
Fair value 497  
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value 0  
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value 497  
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value 0  
Corporate Bond Securities [Member]    
Fair value 17,335  
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value 0  
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value 17,335  
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value $ 0