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Note 3 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member]
$ in Thousands
Jun. 30, 2025
USD ($)
Restricted cash held as a certificate of deposit $ 477
Fair Value, Inputs, Level 1 [Member]  
Restricted cash held as a certificate of deposit 477
Fair Value, Inputs, Level 2 [Member]  
Restricted cash held as a certificate of deposit 0
Fair Value, Inputs, Level 3 [Member]  
Restricted cash held as a certificate of deposit $ 0