Note 6 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Marketable securities	$ 30,306
Corporate Debt Securities [Member]
Marketable securities	3,549
US Government Agencies Debt Securities [Member]
Marketable securities	24,805
Certificates of Deposit [Member]
Marketable securities	517
Money Market Funds [Member]
Cash equivalents, fair value	4
Cash equivalents, fair value	4
Fair Value, Recurring [Member]
Marketable securities	30,306	$ 9,711
Total assets at fair value	39,749	49,329
Fair Value, Recurring [Member] \| US Treasury Securities [Member]
Cash equivalents, fair value	9,439
Cash equivalents, fair value	9,439
Fair Value, Recurring [Member] \| Corporate Debt Securities [Member]
Marketable securities	3,549	6,058
Fair Value, Recurring [Member] \| Cash and Cash Equivalents 1 [Member]
Cash equivalents, fair value	9,443
Cash equivalents, fair value	9,443
Fair Value, Recurring [Member] \| Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Cash equivalents, fair value	1,435
Marketable securities		1,695
Cash equivalents, fair value	1,435
Fair Value, Recurring [Member] \| US Government Agencies Debt Securities [Member]
Marketable securities	24,805
Fair Value, Recurring [Member] \| Certificates of Deposit [Member]
Marketable securities	517	1,958
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Marketable securities	24,805	0
Total assets at fair value	34,248	39,618
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| US Treasury Securities [Member]
Cash equivalents, fair value	9,439
Cash equivalents, fair value	9,439
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] \| Cash and Cash Equivalents 1 [Member]
Cash equivalents, fair value	9,443
Cash equivalents, fair value	9,443
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Cash equivalents, fair value	0
Marketable securities		0
Cash equivalents, fair value	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| US Government Agencies Debt Securities [Member]
Marketable securities	24,805
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	5,501	9,711
Total assets at fair value	5,501	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	3,549	6,058
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Cash and Cash Equivalents 1 [Member]
Cash equivalents, fair value	0
Cash equivalents, fair value	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Cash equivalents, fair value	1,435
Marketable securities		1,695
Cash equivalents, fair value	1,435
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| US Government Agencies Debt Securities [Member]
Marketable securities	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Certificates of Deposit [Member]
Marketable securities	517	1,958
Fair Value, Recurring [Member] \| Money Market Funds [Member]
Cash equivalents, fair value	4	39,618
Cash equivalents, fair value	4	39,618
Fair Value, Recurring [Member] \| Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash equivalents, fair value	4	39,618
Cash equivalents, fair value	4	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