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Note 2 - Investments (Details Textual)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Debt Securities, Held-to-Maturity, Accrued Interest, before Allowance for Credit Loss $ 609,000 $ 116,000
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss 1,700,000 1,200,000
Debt Securities, Held-to-Maturity, Nonaccrual $ 0 $ 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions 5 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions   7
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions 20 22
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 121 121
Expected Credit Losses on Investments $ 0 $ 0