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Note 6 - Investments - Net Gains (Losses) on Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Gain (Loss) on Securities [Line Items] |  |  |  |
Net realized gains (losses) on investments | $ 13,973 | $ 4,597 | $ 32,636 | $ 4,631
Impairment losses due to intent to sell | 0 | 0 | (1,401) | 0
Net decrease (increase) in expected credit losses | 186 | 0 | (2,596) | 0
Net unrealized gain (losses) on investments | 2,813 | 4,419 | 916 | 33,005
Total net gains (losses) on investments | 16,972 | 9,016 | 29,555 | 37,636
Fixed-maturities available for sale |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Fixed maturities available for sale, net realized gain (loss) | 13,777 | 4,401 | 31,998 | 5,209
Gross investment gains from sales and redemptions | 14,219 | 4,697 | 34,422 | 10,926
Gross investment losses from sales and redemptions | (442) | (296) | (2,424) | (5,717)
Trading Securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Trading securities, net realized gain (loss) | 0 | 19 | 4 | (391)
Equity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Equity securities, net realized gain (loss) | 0 | (28) | 361 | (708)
Other investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Other investments, net realized gain (loss) | $ 196 | $ 205 | $ 273 | $ 521

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