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Note 12 - Income Taxes Income Tax (Details) (USD $)
Mar. 31, 2015
Operating Loss Carryforwards [Line Items]  
Operating Loss Carryforwards $ 1,500,000,000us-gaap_OperatingLossCarryforwards
Deferred Tax Assets, Tax Credit Carryforwards, Foreign 6,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 33,500,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
State and Local NOL Carryforwards [Member]  
Operating Loss Carryforwards [Line Items]  
Valuation Allowance, Amount $ 18,300,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= rdn_StateandLocalNOLCarryforwardsMember