Note 10 - Losses and Loss Adjustment Expense Reserve Activity (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Increase in Incurred But Not Reported Reserves	$ 19.4
Mortgage Insurance Segment
Default To Claim Rate Estimate, Gross, For New Defaults		9.00%
Primary Mortgage Product | Mortgage Insurance Segment
Default To Claim Rate Estimate, Gross, For New Defaults	8.00%