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Note 6 - Investment and Equity Securities (Details Textual)
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss $ 1,500,000 $ 1,600,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions 39  
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 163  
Equity Securities, FV-NI, Current $ 855,000 955,000
Equity Securities, FV-NI, Unrealized Gain (Loss) [1] (9,000) (161,000)
Equity Securities, FV-NI, Realized Gain (Loss) $ 71,000 $ 0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Interest Receivable and Other Assets Interest Receivable and Other Assets
Asset Pledged as Collateral [Member] | Deposits [Member]    
Financial Instruments, Owned, at Fair Value $ 112,100,000 $ 118,800,000
[1] Not within scope of ASC 606