Note 7 - Reinsurance Net Premiums Written and Earned, Insurance (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019		Sep. 30, 2018
Premiums Written, Net [Abstract]
Direct Premiums Written		$ 287,000	$ 279,137	$ 828,022		$ 820,449
Assumed Premiums Written	[1]	2,608	1,987	7,528		4,803
Ceded Premiums Written	[2]	(15,455)	(24,348)	(39,900)		(76,162)
Net premiums written—insurance		274,153	256,776	795,650		749,090
Premiums Earned, Net [Abstract]
Direct Premiums Earned		305,493	272,505	919,507	[3]	796,448
Assumed Premiums Earned	[1]	2,614	1,994	7,545		4,822
Ceded Premiums Earned	[2]	(26,922)	(16,068)	(83,189)	[3]	(48,945)
Net premiums earned—insurance		281,185	258,431	843,863	[3]	752,325
Ceded Credit Risk [Line Items]
Ceding Commissions Earned		12,153	8,373	37,191	[3]	25,728
Ceded losses		$ 771	$ 1,191	$ 4,326		$ 3,356

[1] Includes premiums earned from our participation in certain credit risk transfer programs.

[2] Net of profit commission.

[3] Includes a cumulative adjustment to unearned premiums recorded in the second quarter of 2019 related to an update to the amortization rates used to recognize revenue for Single Premium Policies. See Note 3 for further information.