Note 7 - Investments - Gain of Realignment (Details) - USD ($) $ in Thousands			12 Months Ended
		May 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash			$ 4,818,000	$ 0
Carrying Value of Dow Corning Equity Investment			(1,560,000)
Carrying Value of HSG Equity Investment		$ (383,000)	(383,000)
Other (1)	[1]		(199,000)
Gain			$ 2,676,000

[1] Primarily consists of the release of accumulated other comprehensive income items related to unamortized actuarial losses related to Dow Corning's pension plan and foreign currency translation gains in the amounts of $260 million and $45 million, respectively.