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Note 10 - Reserve for Losses and Loss Adjustment Expenses - Schedule of Incurred Losses and Allocated Loss Adjustment Expenses on Special Property Insurance (Details) - Special Property Product Line [Member]
$ in Thousands
Dec. 31, 2025
USD ($)
Claims
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Liability for Claims and Claims Adjustment Expense [Line Items]          
Insurance contracts, claim expense [1] $ 108,767        
Insurance contracts, incurred but not reported liabilities [1] $ 80,398        
Insurance contracts, number of claims | Claims [1] 1,262        
Insurance contracts, claims paid and allocated claim adjustment expense [1] $ 18,667        
Reserve for losses and loss adjustment expense, net of reinsurance [1] 90,100        
Short-Duration Insurance Contract, Prior Accident Years [Member]          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Insurance contracts, claim expense [1] 216 $ 47 $ 46 $ 35 $ 109
Insurance contracts, incurred but not reported liabilities [1] $ 150        
Insurance contracts, number of claims | Claims [1] 13        
Insurance contracts, claims paid and allocated claim adjustment expense [1] $ 54 47 46 35 109
Short-Duration Insurance Contract, Accident Year 2021 [Member]          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Insurance contracts, claim expense [1] 2,230 2,428 2,172 1,641 2,138
Insurance contracts, incurred but not reported liabilities [1] $ 695        
Insurance contracts, number of claims | Claims [1] 34        
Insurance contracts, claims paid and allocated claim adjustment expense [1] $ 1,338 906 653 347 $ 141
Short-Duration Insurance Contract, Accident Year 2022 [Member]          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Insurance contracts, claim expense [1] 8,789 9,425 8,755 7,160  
Insurance contracts, incurred but not reported liabilities [1] $ 1,854        
Insurance contracts, number of claims | Claims [1] 98        
Insurance contracts, claims paid and allocated claim adjustment expense [1] $ 5,355 3,445 1,603 $ 746  
Short-Duration Insurance Contract, Accident Year 2023 [Member]          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Insurance contracts, claim expense [1] 10,278 8,335 5,005    
Insurance contracts, incurred but not reported liabilities [1] $ 2,308        
Insurance contracts, number of claims | Claims [1] 147        
Insurance contracts, claims paid and allocated claim adjustment expense [1] $ 5,552 1,146 $ 372    
Short-Duration Insurance Contract, Accident Year 2024 [Member]          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Insurance contracts, claim expense [1] 24,428 21,811      
Insurance contracts, incurred but not reported liabilities [1] $ 17,521        
Insurance contracts, number of claims | Claims [1] 440        
Insurance contracts, claims paid and allocated claim adjustment expense [1] $ 4,024 $ 869      
Short-Duration Insurance Contract, Accident Year 2025 [Member]          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Insurance contracts, claim expense [1] 62,826        
Insurance contracts, incurred but not reported liabilities [1] $ 57,870        
Insurance contracts, number of claims | Claims [1] 530        
Insurance contracts, claims paid and allocated claim adjustment expense [1] $ 2,344        
[1] Data presented for these calendar years is required supplementary information, which is unaudited.