Note 13 - Discontinued Operations (Details) - Net Assets of Momotombo Power Plant (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	May 30, 2013 Momotombo Power Plant [Member]
Note 13 - Discontinued Operations (Details) - Net Assets of Momotombo Power Plant [Line Items]
Cash and cash equivalents	$ 28,893	$ 66,628	$ 52
Accounts receivable			2,274
Prepaid expenses and other	35,839	34,144	167
Property, plant and equipment			3,935
Accounts payable and accrued expenses	(90,651)	(98,001)	(493)
Deferred income taxes			(442)
Accrued severance pay			(313)
Other liabilities			(590)
Net assets	$ 68,673	$ 60,955	$ 4,590