Note 2 - Fair Value Measurements - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Cash and cash equivalents	$ 2,374	$ 10,266
Fair Value, Recurring [Member]
Unrealized Gain (Loss), before Tax	0	5
Total financial assets, adjusted cost	17,921	17,830
Assets, Fair Value Disclosure	17,921	17,835
Total financial liabilities	2,785	26
Fair Value, Recurring [Member] \| Cash and Cash Equivalents [Member]
Assets, Fair Value Disclosure	1,085	5,823
Fair Value, Recurring [Member] \| Debt Securities Available for Sale [Member]
Assets, Fair Value Disclosure	16,836	12,012
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Money Market Funds [Member]
Cash and cash equivalents	1,085	5,823
Money market funds, fair value	1,085	5,823
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Money Market Funds [Member] \| Cash and Cash Equivalents [Member]
Money market funds, fair value	1,085	5,823
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Private Placement Warrants [Member]
Warrants and Rights Outstanding	0	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Asset-Backed Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	904
Unrealized Gain (Loss), before Tax	0
Debt Securities, Available-for-Sale	904
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Asset-Backed Securities [Member] \| Debt Securities Available for Sale [Member]
Debt Securities, Available-for-Sale	904
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Corporate Bond Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	10,049	9,660
Unrealized Gain (Loss), before Tax	0	4
Debt Securities, Available-for-Sale	10,049	9,664
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Corporate Bond Securities [Member] \| Debt Securities Available for Sale [Member]
Debt Securities, Available-for-Sale	10,049	9,664
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Commercial Paper [Member]
Debt Securities, Available-for-Sale, Amortized Cost	3,396	945
Unrealized Gain (Loss), before Tax	0	0
Debt Securities, Available-for-Sale	3,396	945
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Commercial Paper [Member] \| Debt Securities Available for Sale [Member]
Debt Securities, Available-for-Sale	3,396	945
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| US Government Debt Securities [Member]
Debt Securities, Available-for-Sale, Amortized Cost	2,487	1,402
Unrealized Gain (Loss), before Tax	0	1
Debt Securities, Available-for-Sale	2,487	1,403
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| US Government Debt Securities [Member] \| Debt Securities Available for Sale [Member]
Debt Securities, Available-for-Sale	2,487	1,403
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Derivative Financial Instruments, Liabilities [Member]
Derivative warrant liabilities	788	$ 26
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Convertible Note, Current [Member]
Convertible Debt, Fair Value Disclosures	$ 1,997

Represents amortized cost for cash and cash equivalents and debt securities, available-for-sale.

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Fair value portion of asset recognized for present right to economic benefit.

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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

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- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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