Note 14 - Underwriting Information - Schedule of Gross Written Premiums (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Gross written premiums	$ 1,141,558,000	$ 881,868,000	$ 535,175,000
Percentage of Gross Written Premiums	100.00%	100.00%	100.00%
Palomar Specialty Insurance Company [Member]
Gross written premiums	$ 653,809,000	$ 489,720,000	$ 383,064,000
Percentage of Gross Written Premiums	57.30%	55.50%	71.60%
Palomar Excess And Surplus Insurance Company [Member]
Gross written premiums	$ 487,749,000	$ 392,148,000	$ 152,111,000
Percentage of Gross Written Premiums	42.70%	44.50%	28.40%
CALIFORNIA
Gross written premiums	$ 600,791,000	$ 418,809,000	$ 244,416,000
Percentage of Gross Written Premiums	52.60%	47.50%	45.70%
TEXAS
Gross written premiums	$ 95,517,000	$ 90,459,000	$ 62,893,000
Percentage of Gross Written Premiums	8.40%	10.30%	11.80%
WASHINGTON
Gross written premiums	$ 49,494,000	$ 41,827,000	$ 23,608,000
Percentage of Gross Written Premiums	4.30%	4.70%	4.40%
HAWAII
Gross written premiums	$ 47,388,000	$ 40,157,000	$ 34,993,000
Percentage of Gross Written Premiums	4.20%	4.50%	6.50%
FLORIDA
Gross written premiums	$ 47,595,000	$ 38,715,000	$ 27,386,000
Percentage of Gross Written Premiums	4.20%	4.40%	5.10%
OREGON
Gross written premiums	$ 23,220,000	$ 24,108,000	$ 13,677,000
Percentage of Gross Written Premiums	2.00%	2.70%	2.60%
ILLINOIS
Gross written premiums	$ 22,340,000	$ 17,368,000	$ 12,133,000
Percentage of Gross Written Premiums	2.00%	2.00%	2.30%
NEW YORK
Gross written premiums	$ 18,424	$ 12,510	$ 3,077
Percentage of Gross Written Premiums	1.60%	1.50%	0.60%
Other States [Member]
Gross written premiums	$ 236,789,000	$ 197,915,000	$ 112,992,000
Percentage of Gross Written Premiums	20.70%	22.40%	21.10%
Fronting Premium [Member]
Gross written premiums	$ 364,250,000	$ 223,249,000	$ 11,459,000
Percentage of Gross Written Premiums	31.90%	25.30%	2.20%
Residential Earthquake [Member]
Gross written premiums	$ 253,530,000	$ 213,803,000	$ 171,048,000
Percentage of Gross Written Premiums	22.20%	24.20%	32.00%
Commercial Earthquake [Member]
Gross written premiums	$ 183,368,000	$ 131,677,000	$ 90,552,000
Percentage of Gross Written Premiums	16.10%	14.90%	16.90%
Inland Marine [Member]
Gross written premiums	$ 140,067,000	$ 105,068,000	$ 57,124,000
Percentage of Gross Written Premiums	12.30%	11.90%	10.70%
Casualty [Member]
Gross written premiums	$ 76,864,000	$ 35,791,000	$ 9,584,000
Percentage of Gross Written Premiums	6.70%	4.10%	1.90%
Hawaii Hurricane [Member]
Gross written premiums	$ 38,188,000	$ 32,967,000	$ 30,298,000
Percentage of Gross Written Premiums	3.30%	3.70%	5.60%
Commercial All Risk [Member]
Gross written premiums	$ 35,515,000	$ 51,671,000	$ 38,640,000
Percentage of Gross Written Premiums	3.10%	5.90%	7.20%
Flood Insurance Product [Member]
Gross written premiums	$ 20,087,000	$ 14,539,000	$ 11,652,000
Percentage of Gross Written Premiums	1.80%	1.70%	2.20%
Specialty Homeowners [Member]
Gross written premiums		$ 29,959,000	$ 67,894,000
Percentage of Gross Written Premiums	(0.00%)	3.40%	12.70%
Specialty Homeowners	$ (101,000)
Service, Other [Member]
Gross written premiums	$ 29,790,000	$ 43,144,000	$ 46,924,000
Percentage of Gross Written Premiums	2.60%	4.90%	8.60%