v3.25.2
Note 9 - Fair Value Measurements and Disclosures (Details Textual)
 6 Months Ended
Jun. 30, 2025
USD ($)
Issuer
Security
Jun. 30, 2024
USD ($)
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings $ 0  
Number of underlying issuers | Issuer 3  
Expected credit losses or prepayments $ 0  
Swap rate period 30 years  
Measurement Input, Discount Rate [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Discount rate 0.0863  
Fair Value, Inputs, Level 3 [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings $ 0 $ 0
Fair Value, Inputs, Level 3 [Member] | Collateralized Debt Obligations [Member]    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Number of trust preferred securities | Security 1