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Note 2 - Summary of Significant Accounting Policies - Debt Securities by Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Within one year, amortized cost $ 8,162  
Within one year, fair value 8,160  
After one year through two years, amortized cost 10,881  
After one year through two years, fair value 10,986  
Amortized cost 19,043 $ 15,800
Fair value $ 19,146 $ 15,714