Note 13 - Discontinued Operations (Details) - Net Assets of Momotombo Power Plant (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	May 30, 2013 Momotombo Power Plant [Member]
Note 13 - Discontinued Operations (Details) - Net Assets of Momotombo Power Plant [Line Items]
Cash and cash equivalents	$ 47,927	$ 57,354	$ 52
Accounts receivable			2,274
Prepaid expenses and other	33,728	29,654	167
Property, plant and equipment			3,935
Accounts payable and accrued expenses	(93,820)	(98,047)	(493)
Deferred income taxes			(442)
Accrued severance pay			(313)
Other liabilities			(590)
Net assets			$ 4,590