Quarterly report [Sections 13 or 15(d)]

Note 4 - Securities (Details Textual)

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Note 4 - Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest $ 0   $ 0   $ 0
Debt Securities, Available-for-Sale, Realized Gain (Loss) (7,812) $ 0 (16,375) $ 0  
Collateralized Mortgage-Backed Securities [Member]          
Debt Securities, Available-for-Sale, Sold at Par Value 83,400   153,900    
Debt Securities, Available-for-Sale, Realized Gain (Loss) (7,800)   (16,400)    
US Treasury Securities and Residential Mortgage-Backed Securities [Member]          
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest 0   0   0
US States and Political Subdivisions Debt Securities [Member]          
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest 0   0   0
Asset Not Pledged as Collateral and Asset Pledged as Collateral without Right [Member]          
Debt Securities $ 1,210,000   $ 1,210,000   $ 1,430,000