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Note 6 - Investments and Equity Securities (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss $ 1,500,000   $ 1,500,000   $ 1,600,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions 17   17    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 165   165    
Equity Securities, FV-NI, Current $ 895,000   $ 895,000   955,000
Equity Securities, FV-NI, Unrealized Gain (Loss) [1] 14,000 $ 48,000 (65,000) $ (157,000)  
Asset Pledged as Collateral [Member] | Deposits [Member]          
Financial Instruments, Owned, at Fair Value $ 116,200,000   $ 116,200,000   $ 118,800,000
[1] Not within scope of ASC 606