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Note 2 - Summary of Significant Accounting Policies - Debt Securities by Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Within one year, amortized cost $ 14,802  
Within one year, fair value 14,694  
After one year through two years, amortized cost 4,883  
After one year through two years, fair value 4,804  
Amortized cost 19,685 $ 9,341
Fair value $ 19,498 $ 9,173