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Note 8 - Reinsurance - Net Premiums Written and Earned, Insurance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Premiums Written, Net [Abstract]
Direct premiums written	$ 248,849	$ 271,545	$ 509,468	$ 551,027
Assumed premiums written	1,615	3,192	3,913	6,643
Ceded premiums written	(11,766)	(43,580)	(20,601)	(63,123)
Net premiums written	238,698	231,157	492,780	494,547
Premiums Earned, Net [Abstract]
Direct premiums earned	282,507	315,305	585,228	616,559
Assumed premiums earned	1,615	3,197	3,913	6,653
Ceded premiums earned	(29,366)	(69,207)	(62,513)	(96,502)
Net premiums earned	254,756	249,295	526,628	526,710
Ceded Credit Risk [Line Items]
Ceding commissions earned	7,919	13,453	18,326	23,419
Ceded losses	(1,078)	$ 39,635	2,668	$ 41,597
Deferred ceding commissions	$ 43,600		$ 43,600		$ 52,500

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