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Note 6 - Investments Net Investment Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net Investment Income [Line Items] |  |  |
Gross investment income | $ 179,932 | $ 159,955 | $ 133,648
Investment expenses | (8,136) | (7,480) | (6,400)
Net investment income | 171,796 | 152,475 | 127,248
Fixed-maturities available for sale |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 155,104 | 141,552 | 122,890
Equity securities |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 7,028 | 7,157 | 4,318
Short-term investments |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | 17,255 | 10,270 | 5,453
Other investments |  |  |
Net Investment Income [Line Items] |  |  |
Gross investment income | $ 545 | $ 976 | $ 987

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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