v3.26.3
Note 2 - Significant Accounting Policies - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Fair Value, Recurring [Member]    
Totals $ 100,463 $ 91,663
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Investments 35,462 42,776
Fair Value, Recurring [Member] | Corporate Bond Securities [Member]    
Investments 6,229 6,865
Fair Value, Recurring [Member] | Commercial Paper [Member]    
Investments 25,336 18,252
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Totals 40,699 32,963
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member]    
Investments 28,349 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 59,764 58,700
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]    
Investments 7,113 14,873
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member]    
Investments 6,229 6,865
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]    
Investments 25,336 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 33,436 23,770
Cash Equivalents [Member] | Fair Value, Recurring [Member]    
Cash Equivalents 33,436 23,770
Cash Equivalents [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash Equivalents 12,350 5,060
Cash Equivalents [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash Equivalents 21,086 18,710
Cash Equivalents [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash Equivalents $ 0 $ 0