Note 5 - Investments Net Gains (Losses) on Investments (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on investments		$ 7,024	$ 1,721	$ 18,663	$ 34
Impairment losses due to intent to sell		(779)	0	(1,401)	0
Net decrease (increase) in expected credit losses		(2,782)	0	(2,782)	0
Net unrealized gain (losses) on investments		24,948	9,117	(1,897)	28,586
Total net gains (losses) on investments		28,411	10,838	12,583	28,620
Fixed-maturities available for sale
Gain (Loss) on Securities [Line Items]
Fixed maturities available for sale, net realized gain (loss)	[1]	6,974	1,303	18,221	808
Gross investment gains from sales and redemptions		8,304	2,064	20,203	6,229
Gross investment losses from sales and redemptions		(1,330)	(761)	(1,982)	(5,421)
Trading Securities
Gain (Loss) on Securities [Line Items]
Trading securities, net realized gain (loss)		(45)	274	4	(410)
Equity securities
Gain (Loss) on Securities [Line Items]
Equity securities, net realized gain (loss)		51	0	361	(680)
Short-term investments
Gain (Loss) on Securities [Line Items]
Other investments, net realized gain (loss)		$ 44	$ 144	$ 77	$ 316

[1] Components of net realized gains (losses) on fixed-maturities available for sale include: Three Months Ended
June 30,Six Months Ended
June 30,(In thousands)2020201920202019Gross investment gains from sales and redemptions$8,304  $2,064  $20,203  $6,229  Gross investment losses from sales and redemptions(1,330) (761) (1,982) (5,421)