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Note 10 - Income Taxes - Valuation Allowances (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Federal Income Tax, Valuation Allowances [Abstract] |  |
Deferred Tax Assets, Valuation Allowance | $ 77,728 | $ 66,437

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- Definition Federal Income Tax, Valuation Allowances [Abstract] + References No definition available. + Details
Name: | rdn_FederalIncomeTaxValuationAllowancesAbstract
Namespace Prefix: | rdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant