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Note 7 - Deposits (Details Textual) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deposit Liabilities, Accrued Interest $ 1.7 $ 8.5 $ 22.3
Geographic Distribution, Domestic [Member]      
Time Deposits, at or Above FDIC Insurance Limit 2,700.0 2,900.0  
Geographic Distribution, Foreign [Member]      
Time Deposits, at or Above FDIC Insurance Limit $ 156.9 $ 142.8