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Note 6 - Investments - Net Changes in Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Gain (Loss) on Securities [Line Items]
Net changes in unrealized gains (losses) on investments	$ 9,919	$ 24,032	$ 7,597	$ (1,010)
Trading Securities
Gain (Loss) on Securities [Line Items]
Trading Securities, Change in Unrealized Holding Gain (Loss)	4,601	13,790	(3,448)	11,131
Equity securities
Gain (Loss) on Securities [Line Items]
Equity Securities, Change in Unrealized Holding Gain (Loss)	5,140	10,443	9,983	(12,612)
Other investments
Gain (Loss) on Securities [Line Items]
Other Investments, Change in Unrealized Holding Gain (Loss)	$ 178	$ (201)	$ 1,062	$ 471

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- Definition

Amount of unrealized holding gain (loss) recognized in the income statement for investments in equity securities and securities classified as trading.

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- Definition

Amount of the change in unrealized holding gain (loss) recognized in the income statement for investments in equity securities.

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- Definition

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Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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