Note 11 - Losses and LAE - Mortgage Insurance Reserve for Losses and LAE Rollforward (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 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	885,498
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	85,807	356,555
Incurred Losses and LAE Prior years	(36,695)	(17,223)
Total incurred losses and LAE	49,112	339,332
Deduct paid claims and LAE related to [Abstract]
Paid Losses and LAE Current year	246	1,594
Paid losses and LAE Prior years	14,447	44,580
Total paid losses and LAE	14,693	46,174
Balance at end of period, net of reinsurance recoverables	806,757	679,837
Add: Reinsurance recoverables	74,006	55,154
Balance at end of period	$ 880,763	$ 734,991