Note 15 - Underwriting Information - Schedule of Gross Written Premiums (Details) - USD ($) $ in Thousands	12 Months Ended
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%

Disaggregation of Revenue [Line Items]