Note 10 - Losses and Loss Adjustment Expense Reserve for Losses and LAE by Segment (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserve for losses and loss adjustment expense		$ 738,885	$ 404,765
Mortgage insurance loss reserves
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserve for losses and loss adjustment expense	[1]	734,991	401,273
Title insurance loss reserves
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserve for losses and loss adjustment expense		3,894	3,492
First Lien Mortgage Insurance Products | Primary Case Reserves | Mortgage insurance loss reserves
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserve for losses and loss adjustment expense		$ 660,100	$ 339,800

[1] Primarily comprises first lien primary case reserves of $660.1 million and $339.8 million at June 30, 2020 and December 31, 2019, respectively.