Note 11 - Losses and LAE - Mortgage Insurance Loss Reserves Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loss reserve [Roll Forward]
Balance at January 1	$ 404,765
Deduct paid claims and LAE related to [Abstract]
Balance at December 31	848,413	$ 404,765
Mortgage segment
Loss reserve [Roll Forward]
Balance at January 1	401,273	397,891	$ 507,588
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	14,594	11,009	8,350
Balance at beginning of period, net of reinsurance recoverables	386,679	386,882	499,238
Add losses and LAE incurred in respect of default notices reported and unreported in [Abstract]
Current year	517,807	146,733	135,291
Prior years	(34,547)	(14,709)	(31,699)
Total incurred losses and LAE	483,260	132,024	103,592
Deduct paid claims and LAE related to [Abstract]
Paid claims and LAE - Current year	4,148	4,220	5,856
Paid claims and LAE - Prior years	93,453	128,007	210,092
Total paid claims and LAE	97,601	132,227	215,948
Balance at end of period, net of reinsurance recoverables	772,338	386,679	386,882
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	71,769	14,594	11,009
Balance at December 31	$ 844,107	$ 401,273	$ 397,891