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Note 10 - Losses and LAE Mortgage Insurance Loss Reserves Rollforward (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) incident | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Number of Natural Disasters | incident | 2 |  |  |  |  |
Loss reserve [Roll Forward] |  |  |  |  |  |
Balance at January 1 | $ 507,588 |  |  |  |  |
Deduct paid claims and LAE related to [Abstract] |  |  |  |  |  |
Balance at September 30 | $ 488,656 |  |  |  | $ 507,588 |
Mortgage Insurance Segment |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Average Default To Claim Rate Estimate, Gross, For New Defaults | 9.00% |  |  |  |  |
Loss reserve [Roll Forward] |  |  |  |  |  |
Balance at January 1 | $ 507,588 |  | $ 760,269 |  | 760,269 |
Less reinsurance recoverables | 8,350 | [1] | 6,851 | [1] | 6,851 | [1]
Balance at beginning of period, net of reinsurance recoverables | 499,238 |  | 753,418 |  | 753,418 |
Add losses and LAE incurred in respect of default notices reported and unreported in [Abstract] |  |  |  |  |  |
Current year | 36,516 | [2] | 51,447 | [2] |  |
Prior years | 391 |  | (4,316) |  |  |
Total incurred losses and LAE | 36,907 |  | 47,131 |  |  |
Deduct paid claims and LAE related to [Abstract] |  |  |  |  |  |
Paid Losses and LAE Current year | 226 | [2] | 42 | [2] |  |
Paid losses and LAE Prior years | 59,700 |  | 82,046 |  |  |
Total paid losses and LAE | 59,926 |  | 82,088 |  |  |
Balance at end of period, net of reinsurance recoverables | 476,219 |  | 718,461 |  | 499,238 |
Add reinsurance recoverables | 8,973 | [1] | 7,708 | [1] | 8,350 | [1]
Balance at September 30 | 485,192 |  | $ 726,169 |  | $ 507,588 |
Default To Claim Rate Detail [Abstract] |  |  |  |  |  |
Default To Claim Rate Estimate, Gross, For New Defaults |  |  | 11.50% |  | 10.00% |
Mortgage Insurance Segment | Pool Insurance Mortgage Insurance Product [Member] |  |  |  |  |  |
Loss reserve [Roll Forward] |  |  |  |  |  |
Balance at January 1 | 13,463 |  |  |  |  |
Less reinsurance recoverables | 35 | [3] |  |  |  |
Deduct paid claims and LAE related to [Abstract] |  |  |  |  |  |
Add reinsurance recoverables | 20 | [3] |  |  | $ 35 | [3]
Balance at September 30 | 11,952 |  |  |  | 13,463 |
Mortgage Insurance Segment | Primary Mortgage Product [Member] |  |  |  |  |  |
Loss reserve [Roll Forward] |  |  |  |  |  |
Less reinsurance recoverables | 8,315 | [3] |  |  |  |
Deduct paid claims and LAE related to [Abstract] |  |  |  |  |  |
Add reinsurance recoverables | $ 8,953 | [3] |  |  | $ 8,315 | [3]
Default To Claim Rate Detail [Abstract] |  |  |  |  |  |
Weighted Average Default To Claim Rate Assumption Net Of Denials Rescissions and Reinstatements | 33.00% |  |  |  | 31.00% |
Default To Claim Rate Estimate, Gross, For Pre-Foreclosure Stage Defaults | 68.00% |  |  |  |  |
Gross Default To Claim Rate Estimate | 75.00% |  |  |  |  |
Hurricanes Harvey and Irma [Member] | Mortgage Insurance Segment |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Concentration Risk, Percentage | 9.00% |  |  |  | 9.00% |
Default To Claim Rate Detail [Abstract] |  |  |  |  |  |
Risk In Force | $ 4,700,000 |  |  |  | $ 4,600,000 |
Participating Policies, Amount in Force | $ 17,900,000 |  |  |  | $ 17,400,000 |
Hurricanes Harvey and Irma [Member] | Mortgage Insurance Segment | Primary Mortgage Product [Member] |  |  |  |  |  |
Default To Claim Rate Detail [Abstract] |  |  |  |  |  |
Default To Claim Rate Estimate, Gross, For New Defaults | 3.00% |  |  |  |  |
[1] | Related to ceded losses recoverable, if any, on captive reinsurance transactions, the QSR Transactions and the Single Premium QSR Transactions. See Note 7 for additional information.
[2] | Related to underlying defaulted loans with a most recent default notice dated in the year indicated. For example, if a loan had defaulted in a prior year, but then subsequently cured and later re-defaulted in the current year, that default would be considered a current year default.
[3] | Represents ceded losses on captive reinsurance transactions, the QSR Transactions and the Single Premium QSR Transactions.

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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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