Note 14 - Underwriting Information (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Premiums Written, Gross	$ 1,141,558	$ 881,868	$ 535,175
Percentage of Gross Written Premiums	100.00%	100.00%	100.00%
Revenue Benchmark [Member] | Product Concentration Risk [Member] | Largest Program Administrator [Member]
Premiums Written, Gross	$ 394,100	$ 322,400	$ 215,300
Percentage of Gross Written Premiums	34.50%	36.60%	40.20%
Revenue Benchmark [Member] | Product Concentration Risk [Member] | Second Largest Program Administrator [Member]
Premiums Written, Gross	$ 152,400	$ 95,100
Percentage of Gross Written Premiums	13.30%	10.80%
Revenue Benchmark [Member] | Product Concentration Risk [Member] | Other Program Administrators [Member]
Premiums Written, Gross	$ 0	$ 0	$ 0
Percentage of Gross Written Premiums	10.00%	10.00%	10.00%