Note 3 - Fair Value Measurements - Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Marketable Securities	$ 144,426	$ 178,263
Corporate Debt Securities [Member]
Marketable Securities	111,644	86,636
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable Securities	16,824	68,977
Certificates of Deposit [Member]
Marketable Securities	10,164	14,960
US Treasury Securities [Member]
Marketable Securities	1,698	1,664
Asset-Backed Securities [Member]
Marketable Securities	4,096	6,026
Fair Value, Recurring [Member]
Total assets	144,426	186,646
Fair Value, Recurring [Member] \| Corporate Debt Securities [Member]
Marketable Securities	111,644	86,636
Fair Value, Recurring [Member] \| Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable Securities	16,824	68,977
Fair Value, Recurring [Member] \| Certificates of Deposit [Member]
Marketable Securities	10,164	14,960
Fair Value, Recurring [Member] \| US Treasury Securities [Member]
Marketable Securities	1,698	1,664
Fair Value, Recurring [Member] \| Asset-Backed Securities [Member]
Marketable Securities	4,096	6,026
Fair Value, Recurring [Member] \| Money Market Funds [Member]
Money market funds (cash equivalents)	0	8,383
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Total assets	18,522	79,024
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Corporate Debt Securities [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable Securities	16,824	68,977
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Certificates of Deposit [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| US Treasury Securities [Member]
Marketable Securities	1,698	1,664
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Asset-Backed Securities [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Money Market Funds [Member]
Money market funds (cash equivalents)	0	8,383
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Total assets	125,904	107,622
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Corporate Debt Securities [Member]
Marketable Securities	111,644	86,636
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Certificates of Deposit [Member]
Marketable Securities	10,164	14,960
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| US Treasury Securities [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Asset-Backed Securities [Member]
Marketable Securities	4,096	6,026
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Money Market Funds [Member]
Money market funds (cash equivalents)	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Total assets	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Corporate Debt Securities [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Certificates of Deposit [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| US Treasury Securities [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Asset-Backed Securities [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Money Market Funds [Member]
Money market funds (cash equivalents)	$ 0	$ 0