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Note 2 - Summary of Significant Accounting Policies - Debt Securities by Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Within one year, amortized cost $ 11,872  
Within one year, fair value 11,824  
After one year through two years, amortized cost 8,879  
After one year through two years, fair value 8,841  
Amortized cost 20,751 $ 15,800
Fair value $ 20,665 $ 15,714