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Note 6 - Investments - Net Gains (Losses) on Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Gain (Loss) on Securities [Line Items] |  |  |
Fixed-maturities available for sale, net realized gain (loss) | $ 34,869 | $ 11,262 | $ (11,256)
Trading securities, net realized gain (loss) | 4 | (303) | (1,840)
Equity securities, net realized gain (loss) | 353 | (719) | 532
Realized Gains (Losses) on Investments, Net | 35,826 | 10,843 | (12,094)
Impairment losses due to intent to sell | (1,401) | 0 | (1,744)
Net decrease (increase) in expected credit losses | (1,254) | 0 | 0
Net unrealized gains (losses) on investments | 10,960 | 33,220 | (27,287)
Total net gains (losses) on investments | 44,131 | 44,063 | (41,125)
Net unrealized gains (losses) on investments still held | 12,590 | 28,078 | (24,720)
Other investments |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Other investments, net realized gain (loss) | 600 | 603 | 470
Other Investments, net unrealized gains (losses) on investments still held | 248 | (174) | 447
Fixed-maturities available for sale |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Gross investment gains from sales and redemptions | 37,431 | 17,663 | 1,986
Gross investment losses from sales and redemptions | (2,562) | (6,401) | (13,242)
Trading securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Trading Securities, net unrealized gains (losses) on investments still held | 10,583 | 16,346 | (16,281)
Equity securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Equity Securities, net unrealized gains (losses) on investments still held | $ 1,759 | $ 11,906 | $ (8,886)

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- Definition Amount of the change in unrealized holding gain (loss) recognized in the income statement for investments in equity securities. + References No definition available. + Details
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- Definition This amount represents the net realized gains (losses) on all fixed-maturities, equity, trading, short-term, and other-invested assets securities, excluding other-than-temporary impairments and net unrealized gains (losses) on investment securities. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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