Note 2 - Fair Value of Financial Instruments - Summary of Fair Value Hierarchy for Financial Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Assets, fair value	$ 11,449
Fair Value, Recurring [Member]
Assets, fair value	11,449	$ 25,254
Fair Value, Recurring [Member] \| Money Market Securities [Member]
Assets, fair value	1,210	112
Fair Value, Recurring [Member] \| Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Assets, fair value	7,093	10,633
Fair Value, Recurring [Member] \| Federal Agency Notes [Member]
Assets, fair value	2,223	5,317
Fair Value, Recurring [Member] \| US Treasury Securities [Member]
Assets, fair value		9,192
Fair Value, Recurring [Member] \| Corporate Debt Securities [Member]
Assets, fair value	923
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value	1,210	112
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Money Market Securities [Member]
Assets, fair value	1,210	112
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Assets, fair value	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Federal Agency Notes [Member]
Assets, fair value	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| US Treasury Securities [Member]
Assets, fair value		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Corporate Debt Securities [Member]
Assets, fair value	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value	10,239	25,142
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Money Market Securities [Member]
Assets, fair value	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Assets, fair value	7,093	10,633
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Federal Agency Notes [Member]
Assets, fair value	2,223	5,317
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| US Treasury Securities [Member]
Assets, fair value		9,192
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Corporate Debt Securities [Member]
Assets, fair value	923
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets, fair value	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Money Market Securities [Member]
Assets, fair value	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Assets, fair value	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Federal Agency Notes [Member]
Assets, fair value	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| US Treasury Securities [Member]
Assets, fair value		$ 0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Corporate Debt Securities [Member]
Assets, fair value	$ 0

Note 2 - Fair Value of Financial Instruments - Summary of Fair Value Hierarchy for Financial Assets (Details) - USD ($)
$ in Thousands

Dec. 31, 2025

Dec. 31, 2024

Assets, fair value

$ 11,449

Fair Value, Recurring [Member]

Assets, fair value

11,449

$ 25,254

Fair Value, Recurring [Member] | Money Market Securities [Member]

Assets, fair value

1,210