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Note 3 - Investments (Details Textual)
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Debt Securities, Held-to-Maturity, Accrued Interest, before Allowance for Credit Loss $ 116,000 $ 116,000  
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss 1,500,000 1,200,000  
Debt Securities, Held-to-Maturity, Nonaccrual $ 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 30    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 180    
Other Than Temporary Impairment on Investments $ 0 0 $ 0
Proceeds from Sale of Debt Securities, Available-for-Sale 0 0 0
Debt Securities, Held-to-Maturity, 90 Days or More Past Due, Still Accruing 0    
Debt Securities, Available-for-Sale, Realized Gain (Loss) $ 0 $ 0 $ 0