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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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