Note 11 - Losses and Loss Adjustment Expense - Mortgage Insurance Reserve for Losses and LAE Rollforward (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Loss reserve [Roll Forward]
Balance at beginning of period	$ 404,765
Deduct paid claims and LAE related to [Abstract]
Balance at end of period	825,792
Mortgage segment
Loss reserve [Roll Forward]
Balance at beginning of period	401,273	$ 397,891
Less: Reinsurance recoverables	14,594	11,009
Balance at beginning of period, net of reinsurance recoverables	386,679	386,882
Add losses and LAE incurred in respect of default notices reported and unreported in [Abstract]
Incurred Losses and LAE Current year	448,584	107,866
Incurred Losses and LAE Prior years	(21,494)	(10,579)
Total incurred losses and LAE	427,090	97,287
Deduct paid claims and LAE related to [Abstract]
Paid Losses and LAE Current year	2,841	1,784
Paid losses and LAE Prior years	54,167	101,927
Total paid losses and LAE	57,008	103,711
Balance at end of period, net of reinsurance recoverables	756,761	380,458
Add: Reinsurance recoverables	64,947	13,629
Balance at end of period	$ 821,708	$ 394,087