Note 13 - Discontinued Operations (Details) - Summary of Financial Information Related to Discontinued Operations (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total income from discontinued operations	$ 5,311
Selling and Marketing Expense [Member] | Momotombo Power Plant [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Selling and marketing expenses:	(192)
Momotombo Power Plant [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues - electricity	4,866
Cost of revenues - electricity	(2,869)
Gross margin	1,997
General and administrative expenses:	(140)
Operating income:	1,665
Income from discontinued operations before income taxes	5,311
Income tax provision	(614)
Total income from discontinued operations	$ 4,697