Note 4 - Unconsolidated Investments (Details) - Unconsolidated Investments Mainly in Power Plants (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013	Sep. 30, 2013
Schedule of Equity Method Investments [Line Items]
Sarulla	$ 1,339	[1]	$ 7,076	$ 5,419	[1]
Sarulla [Member]
Schedule of Equity Method Investments [Line Items]
Sarulla	$ 1,339		$ 7,076

[1] Including unconsolidated investments