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Note 8 - Reinsurance - Effect of Reinsurance Programs (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Premiums Written, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |
Direct Premiums Written |  |  |  |  |  |  |  |  | $ 1,108,513,000 | $ 1,132,338,000 | $ 1,089,720,000
Assumed Premiums Written |  |  |  |  |  |  |  |  | 12,197,000 | 10,379,000 | 6,901,000
Ceded Premiums Written |  |  |  |  |  |  |  |  | (87,201,000) | (56,132,000) | (98,314,000)
Net premiums written—insurance |  |  |  |  |  |  |  |  | 1,033,509,000 | 1,086,585,000 | 998,307,000
Premiums Earned, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |
Direct Premiums Earned |  |  |  |  |  |  |  |  | 1,286,527,000 | 1,244,870,000 | 1,074,298,000
Assumed Premiums Earned |  |  |  |  |  |  |  |  | 12,213,000 | 10,382,000 | 6,904,000
Ceded Premiums Earned |  |  |  |  |  |  |  |  | (183,419,000) | (109,903,000) | (67,195,000)
Net premiums earned—insurance | $ 302,140,000 | $ 286,471,000 | $ 249,295,000 | $ 277,415,000 | $ 301,486,000 | $ 281,185,000 | $ 299,166,000 | $ 263,512,000 | 1,115,321,000 | 1,145,349,000 | 1,014,007,000
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ceding commissions earned |  |  |  |  |  |  |  |  | 53,654,000 | 48,659,000 | 33,446,000
Ceded losses |  |  |  |  |  |  |  |  | 58,266,000 | 5,859,000 | $ 5,086,000
Deferred ceding commissions | $ 52,500,000 |  |  |  | $ 74,800,000 |  |  |  | $ 52,500,000 | $ 74,800,000 |

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- Definition Amount of earned premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column D)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e574992-122915 + Details
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- Definition Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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