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Note 3 - Investments (Details Textual)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Held-to-Maturity, Accrued Interest, before Allowance for Credit Loss $ 117,000   $ 116,000
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss 1,900,000   1,500,000
Debt Securities, Held-to-Maturity, Nonaccrual 0   0
Debt Securities, Held-to-Maturity, 90 Days or More Past Due, Still Accruing $ 0   0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions 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 34    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 128    
Expected Credit Losses on Investments $ 0   $ 0
Proceeds from Sale of Debt Securities, Available-for-Sale $ 44,036,000 $ 0  
Debt Securities, Available-for-Sale, Realized Gain (Loss)   $ 0