Note 6 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Marketable securities	$ 28,842
Corporate Debt Securities [Member]
Marketable securities	3,290
Certificates of Deposit [Member]
Marketable securities	522
Money Market Funds [Member]
Cash equivalents, fair value	1,318
Cash equivalents, fair value	1,318
Fair Value, Recurring [Member]
Marketable securities	28,842	$ 9,711
Total assets at fair value	30,160	49,329
Fair Value, Recurring [Member] \| US Treasury Securities [Member]
Cash equivalents, fair value	25,030
Cash equivalents, fair value	25,030
Fair Value, Recurring [Member] \| Corporate Debt Securities [Member]
Marketable securities	3,290	6,058
Fair Value, Recurring [Member] \| Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable securities		1,695
Fair Value, Recurring [Member] \| Certificates of Deposit [Member]
Marketable securities	522	1,958
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Marketable securities	25,030	0
Total assets at fair value	26,348	39,618
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| US Treasury Securities [Member]
Cash equivalents, fair value	25,030
Cash equivalents, fair value	25,030
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		0
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 2 [Member]
Marketable securities	3,812	9,711
Total assets at fair value	3,812	9,711
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| US Treasury Securities [Member]
Cash equivalents, fair value	0
Cash equivalents, fair value	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Corporate Debt Securities [Member]
Marketable securities	3,290	6,058
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable securities		1,695
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Certificates of Deposit [Member]
Marketable securities	522	1,958
Fair Value, Recurring [Member] \| Money Market Funds [Member]
Cash equivalents, fair value	1,318	39,618
Cash equivalents, fair value	1,318	39,618
Fair Value, Recurring [Member] \| Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash equivalents, fair value	1,318	39,618
Cash equivalents, fair value	1,318	39,618
Fair Value, Recurring [Member] \| Money Market Funds [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash equivalents, fair value	0	0
Cash equivalents, fair value	$ 0	$ 0