Note 7 - Reinsurance Single Premium QSR Program (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended			36 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019	Dec. 31, 2017	Dec. 31, 2014	Dec. 31, 2019
Ceded Premiums Written	[1]	$ 43,580	$ 14,289	$ 63,123		$ 24,445
2016 Single Premium QSR | Radian Guaranty
Ceded Insurance Commission Percentage				25.00%
2016 Single Premium QSR | Radian Guaranty | Reinsurer Concentration Risk
Concentration Risk, Percentage							35.00%
Risk In Force		4,533,000		$ 4,533,000					$ 5,351,000
2018 Single Premium QSR | Radian Guaranty
Ceded Insurance Commission Percentage				25.00%
2018 Single Premium QSR | Radian Guaranty | Reinsurer Concentration Risk
Concentration Risk, Percentage				65.00%
Risk In Force		2,711,000		$ 2,711,000					3,231,000
2020 Single Premium QSR | Radian Guaranty
Ceded Premiums Written				$ 250,000
Ceded Insurance Commission Percentage				25.00%
2020 Single Premium QSR | Radian Guaranty | Reinsurer Concentration Risk
Concentration Risk, Percentage				65.00%
Risk In Force		$ 929,000		$ 929,000					$ 0
Minimum | 2016 Single Premium QSR | Radian Guaranty | Reinsurer Concentration Risk
Concentration Risk, Percentage	[2]			20.00%
Maximum | 2016 Single Premium QSR | Radian Guaranty
Loss Ratio				55.00%
Maximum | 2016 Single Premium QSR | Radian Guaranty | Reinsurer Concentration Risk
Concentration Risk, Percentage				65.00%	[2]			35.00%
Maximum | 2018 Single Premium QSR | Radian Guaranty
Loss Ratio				56.00%
Maximum | 2020 Single Premium QSR | Radian Guaranty
Loss Ratio				56.00%

[1] Net of profit commission, which is impacted by the level of ceded losses recoverable, if any, on reinsurance transactions. See Note 10 for additional information on our reserve for losses and reinsurance recoverables.

[2] Effective December 31, 2017, we amended the 2016 Single Premium QSR Agreement to increase the amount of ceded risk on performing loans under the agreement from 35% to 65% for the 2015 through 2017 vintages. Loans included in the 2012 through 2014 vintages, and any other loans subject to the agreement that were delinquent at the time of the amendment, were unaffected by the change and therefore the amount of ceded risk for those loans continues to range from 20% to 35%.