Note 11 - Losses and LAE - Mortgage Insurance Reserve for Losses and LAE Rollforward (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Loss reserve [Roll Forward]
Balance at beginning of period	$ 848,413
Deduct paid claims and LAE related to [Abstract]
Balance at end of period	893,155
Mortgage segment
Loss reserve [Roll Forward]
Balance at beginning of period	844,107	$ 401,273
Less: Reinsurance recoverables	71,769	14,594
Balance at beginning of period, net of reinsurance recoverables	772,338	386,679
Add losses and LAE incurred in respect of default notices reported and unreported in [Abstract]
Incurred Losses and LAE Current year	119,823	448,584
Incurred Losses and LAE Prior years	(53,947)	(21,494)
Total incurred losses and LAE	65,876	427,090
Deduct paid claims and LAE related to [Abstract]
Paid Losses and LAE Current year	499	2,841
Paid losses and LAE Prior years	24,431	54,167
Total paid losses and LAE	24,930	57,008
Balance at end of period, net of reinsurance recoverables	813,284	756,761
Add: Reinsurance recoverables	74,737	64,947
Balance at end of period	$ 888,021	$ 821,708