Note 6 - Marketable Securities - Schedule of (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Amortized cost (1)	[1]	$ 114,587	$ 12,064
Unrealized gains/(losses), net (1)	[1]	518,964	(2,711)
Marketable securities		$ 633,551	$ 9,353

[1] See Albertsons Companies, Inc. discussion below.