Note 13 - Discontinued Operations (Details) - Net Assets of Momotombo Power Plant (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	May 30, 2013 Momotombo Power Plant [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 80,120	$ 57,354	$ 52
Accounts receivable			2,274
Prepaid expenses and other	38,156	29,654	167
Property, plant and equipment			3,935
Accounts payable and accrued expenses	(79,800)	(98,047)	(493)
Deferred income taxes			(442)
Accrued severance pay			(313)
Other liabilities			(590)
Net assets			$ 4,590