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)

v3.23.2
Note 5 - Cash, Cash Equivalents and Investments - Cash Equivalents and Investments Carried at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Fair value $ 9,937  
Total 46,642 $ 38,152
Fair Value, Inputs, Level 1 [Member]    
Total 44,846 22,087
Fair Value, Inputs, Level 2 [Member]    
Total 1,796 16,065
Fair Value, Inputs, Level 3 [Member]    
Total 0 0
Money Market Funds [Member]    
Money market funds, included in cash equivalents 36,705 17,618
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Money market funds, included in cash equivalents 36,705 17,618
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 8,141 3,573
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value 8,141 3,573
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value 0 0
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value 0 0
Corporate Bond Securities [Member]    
Fair value 1,796 15,566
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value 0 0
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair value 1,796 15,566
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value $ 0 0
Debt Security, Government, Non-US [Member]    
Fair value   896
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair value   896
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   499
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   499
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair value   $ 0