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Note 13 - Commitments and Contingencies Guarantor Obligations (Details) $ in Millions	Dec. 31, 2017 USD ($) transaction
Guaranteed Structure Transactions [Abstract]
Number of Guaranteed Structured Transactions For Radian Guaranty	2
Indirect Guarantee of Indebtedness [Member]
Guaranteed Structure Transactions [Abstract]
Number of Guaranteed Structured Transactions For Radian Guaranty	2
Guarantor Obligations, Maximum Exposure, Undiscounted | $	$ 97.8

X

- Definition

Guaranteed Structure Transactions [Abstract]

+ References

No definition available.

+ Details

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- Definition

Number of Guaranteed Structured Transactions For Radian Guaranty

+ References

No definition available.

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X

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248

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- Details

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