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Note 2 - Fair Value Measurements - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis 2 (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Assets, Fair Value Disclosure $ 70,856 $ 85,822
Location, Statement of Financial Position, Balance [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent    
Assets, Fair Value Disclosure 60,293 43,104
Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue    
Assets, Fair Value Disclosure 10,563 42,718
US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-Sale   2,018
US Government Agencies Debt Securities [Member] | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent    
Debt Securities, Available-for-Sale 2,009  
Asset-Backed Securities [Member]    
Debt Securities, Available-for-Sale   5,907
Asset-Backed Securities [Member] | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent    
Debt Securities, Available-for-Sale 5,848  
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]    
Money market funds, fair value 9,064 42,718
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] | Location, Statement of Financial Position, Balance [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue    
Money market funds, fair value 9,064  
Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member]    
Debt Securities, Available-for-Sale 22,486 19,633
Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member] | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent    
Debt Securities, Available-for-Sale 22,486  
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]    
Debt Securities, Available-for-Sale 5,921 7,534
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member] | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent    
Debt Securities, Available-for-Sale 4,422  
Fair Value, Inputs, Level 2 [Member] | US Government Debt Securities [Member]    
Debt Securities, Available-for-Sale 25,528 8,012
Fair Value, Inputs, Level 2 [Member] | US Government Debt Securities [Member] | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent    
Debt Securities, Available-for-Sale 25,528  
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-Sale 2,009 2,018
Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member]    
Debt Securities, Available-for-Sale $ 5,848 $ 5,907