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Note 15 - Underwriting Information (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disaggregation of Revenue [Line Items] |  |  |
Premiums Written, Gross | $ 2,028,252,000 | $ 1,541,962,000 | $ 1,141,558,000
Percentage of Gross Written Premiums | 100.00% | 100.00% | 100.00%
Revenue Benchmark [Member] | Product Concentration Risk [Member] | Largest Program Administrator [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Premiums Written, Gross | $ 411,000,000 | $ 403,400,000 | $ 394,100,000
Percentage of Gross Written Premiums | 20.30% | 26.20% | 34.50%
Revenue Benchmark [Member] | Product Concentration Risk [Member] | Other Program Administrators [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Premiums Written, Gross | $ 0 | $ 0 | $ 0
Percentage of Gross Written Premiums | 10.00% | 10.00% | 10.00%
Revenue Benchmark [Member] | Product Concentration Risk [Member] | Second Largest Program Administrator [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Premiums Written, Gross | $ 237,300,000 |  | $ 152,400,000
Percentage of Gross Written Premiums | 11.70% |  | 13.30%

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