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Note 2 - Investments (Details Textual)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Held-to-Maturity, Accrued Interest, before Allowance for Credit Loss $ 114,000   $ 114,000   $ 116,000
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss 1,000,000   1,000,000   1,500,000
Debt Securities, Held-to-Maturity, Nonaccrual $ 0   $ 0   0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions 0   0    
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 7   7    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions 9   9    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 128   128    
Expected Credit Losses on Investments     $ 0   $ 0
Proceeds from Sale of Debt Securities, Available-for-Sale $ 54,423,000 $ 0 $ 98,459,000 $ 0