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Note 15 - Underwriting Information - Schedule of Gross Written Premiums (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 2,028,252 | $ 1,541,962 | $ 1,141,558
Percentage of Gross Written Premiums | 100.00% | 100.00% | 100.00%
Palomar Specialty Insurance Company [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 995,901 | $ 823,263 | $ 653,809
Percentage of Gross Written Premiums | 49.10% | 53.40% | 57.30%
Palomar Excess And Surplus Insurance Company [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 936,971 | $ 661,404 | $ 487,749
Percentage of Gross Written Premiums | 46.20% | 42.90% | 42.70%
Laulima Insurance Company [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 76,727 | $ 57,295 | $ 0
Percentage of Gross Written Premiums | 3.80% | 3.70% | 0.00%
First Indemnity of America Insurance Company [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 18,653 | $ 0 | $ 0
Percentage of Gross Written Premiums | 0.90% | 0.00% | 0.00%
CALIFORNIA |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 626,399 | $ 668,635 | $ 600,791
Percentage of Gross Written Premiums | 30.90% | 43.40% | 52.60%
TEXAS |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 160,639 | $ 124,416 | $ 95,517
Percentage of Gross Written Premiums | 7.90% | 8.10% | 8.40%
FLORIDA |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 96,764 | $ 67,008 | $ 47,595
Percentage of Gross Written Premiums | 4.80% | 4.30% | 4.20%
HAWAII |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 92,585 | $ 72,558 | $ 47,388
Percentage of Gross Written Premiums | 4.60% | 4.70% | 4.20%
WASHINGTON |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 70,188 | $ 57,900 | $ 49,494
Percentage of Gross Written Premiums | 3.40% | 3.80% | 4.30%
NEW YORK |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 68,119 | $ 38,919 | $ 18,424
Percentage of Gross Written Premiums | 3.40% | 2.50% | 1.60%
ILLINOIS |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 54,406 | $ 20,901 | $ 22,340
Percentage of Gross Written Premiums | 2.70% | 1.40% | 2.00%
COLORADO |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 39,384 | $ 20,149 | $ 8,628
Percentage of Gross Written Premiums | 1.90% | 1.30% | 0.80%
Other States [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 819,768 | $ 471,476 | $ 251,381
Percentage of Gross Written Premiums | 40.40% | 30.50% | 21.90%
Earthquake Premiums [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 571,373 | $ 522,864 | $ 436,897
Percentage of Gross Written Premiums | 28.20% | 33.90% | 38.30%
Casualty [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 542,949 | $ 235,592 | $ 90,388
Percentage of Gross Written Premiums | 26.80% | 15.30% | 7.90%
Inland Marine and Other Property [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 446,184 | $ 334,079 | $ 250,022
Percentage of Gross Written Premiums | 22.00% | 21.70% | 21.90%
Crop [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 247,547 | $ 116,239 | $ 12,110
Percentage of Gross Written Premiums | 12.20% | 7.50% | 1.10%
Fronting Premium [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total gross written premiums | $ 220,199 | $ 333,188 | $ 352,141
Percentage of Gross Written Premiums | 10.80% | 21.60% | 30.80%

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