Note 7 - Reinsurance Single Premium QSR Program (Details) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended		6 Months Ended
		Dec. 31, 2017	Oct. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Ceded Premiums Written	[1]			$ 14,289	$ 31,883	$ 24,445	$ 51,814
2016 Single Premium QSR | Radian Guaranty | Reinsurer Concentration Risk
Risk In Force				5,900,000	6,600,000	5,900,000	6,600,000
2018 Single Premium QSR | Radian Guaranty | Reinsurer Concentration Risk
Risk In Force				$ 2,600,000	$ 1,000,000	$ 2,600,000	$ 1,000,000
Concentration Risk, Percentage		65.00%
Ceded Premiums Written			$ 335,000

[1] Net of profit commission.