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Note 8 - Reinsurance - Net Premiums Written and Earned, Insurance (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Premiums Written, Net [Abstract]
Direct premiums written	$ 260,619	$ 279,482
Assumed premiums written	2,298	3,451
Ceded premiums written	(8,835)	(19,543)
Net premiums written	254,082	263,390
Premiums Earned, Net [Abstract]
Direct premiums earned	302,721	301,254
Assumed premiums earned	2,298	3,456
Ceded premiums earned	(33,147)	(27,295)
Net premiums earned	271,872	277,415
Ceded Credit Risk [Line Items]
Ceding commissions earned	10,407	9,966
Ceded losses	3,746	1,962
Deferred ceding commissions	$ 47,800	$ 71,600

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