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Note 2 - Fair Value Measurements - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Cash and cash equivalents $ 11,210 $ 43,356
Fair Value, Recurring [Member]    
Unrealized Gain (Loss), before Tax (98) 30
Total financial assets 70,954 85,792
Assets, Fair Value Disclosure 70,856 85,822
Total financial liabilities 411 560
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-Sale   2,018
Fair Value, Recurring [Member] | Asset-Backed Securities [Member]    
Debt Securities, Available-for-Sale   5,907
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member]    
Cash and cash equivalents 9,064 42,718
Money market funds, fair value 9,064 42,718
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Private Placement Warrants [Member]    
Private placement warrant liability 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Bond Securities [Member]    
Debt Securities, Available-for-Sale, Amortized Cost 22,519 19,620
Unrealized Gain (Loss), before Tax (33) 13
Debt Securities, Available-for-Sale 22,486 19,633
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Commercial Paper [Member]    
Debt Securities, Available-for-Sale, Amortized Cost 5,923 7,531
Unrealized Gain (Loss), before Tax (2) 3
Debt Securities, Available-for-Sale 5,921 7,534
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Debt Securities [Member]    
Debt Securities, Available-for-Sale, Amortized Cost 25,574 8,003
Unrealized Gain (Loss), before Tax (46) 9
Debt Securities, Available-for-Sale 25,528 8,012
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-Sale, Amortized Cost 2,018 2,018
Unrealized Gain (Loss), before Tax (9) 0
Debt Securities, Available-for-Sale 2,009 2,018
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member]    
Debt Securities, Available-for-Sale, Amortized Cost 5,856 5,902
Unrealized Gain (Loss), before Tax (8) 5
Debt Securities, Available-for-Sale 5,848 5,907
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Derivative Financial Instruments, Liabilities [Member]    
Derivative warrant liability $ 411 $ 560