v3.26.1
Note 2 - Significant Accounting Policies - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Recurring [Member]    
Totals $ 86,753 $ 91,663
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Investments 33,997 42,776
Fair Value, Recurring [Member] | Corporate Bond Securities [Member]    
Investments 6,408 6,865
Fair Value, Recurring [Member] | Commercial Paper [Member]    
Investments 16,961 18,252
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Totals 32,808 32,963
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member]    
Investments 21,814 27,903
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Bond Securities [Member]    
Investments 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]    
Investments 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Totals 53,945 58,700
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]    
Investments 12,183 14,873
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member]    
Investments 6,408 6,865
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]    
Investments 16,961 18,252
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Totals 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member]    
Investments 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Bond Securities [Member]    
Investments 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member]    
Investments 0 0
Cash Equivalents [Member]    
Cash Equivalents 29,387 23,770
Cash Equivalents [Member] | Fair Value, Recurring [Member]    
Cash Equivalents 29,387 23,770
Cash Equivalents [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash Equivalents 10,994 5,060
Cash Equivalents [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash Equivalents 18,393 18,710
Cash Equivalents [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash Equivalents $ 0 $ 0