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Note 4 - Cash, Cash Equivalents and Restricted Cash (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Average Excess Balances Maintained With Federal Reserve Bank $ 1,050 $ 1,090
Margin Deposit Assets 60,900 53,800
Restricted Cash 29,300 6,400
Bank [Member]    
Restricted Cash $ 7,800 $ 8,600