Note 7 - Property, Plant and Equipment and Construction-In-Process (Tables)

12 Months Ended

Dec. 31, 2013

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

	December 31,
	2013			2012 As Revised
	(Dollars in thousands)
Land owned by the Company where the geothermal resource is located	$	30,336		$	32,396
Leasehold improvements		3,386			1,339
Machinery and equipment		101,104			100,499
Office equipment		17,492			15,218
Automobiles		5,745			5,816
Geothermal and recovered energy generation power plants, including geothermal wells and exploration and resource development costs:
United States of America, net of cash grants and impairment charges		1,439,374			1,322,649
Foreign countries		448,161			312,412
Asset retirement cost		7,803			7,214
		2,053,401			1,797,543
Less accumulated depreciation		(601,065	)		(544,670	)
Property, plant and equipment, net	$	1,452,336		$	1,252,873

Construction In Progress [Table Text Block]

	December 31,
	2013		2012
	(Dollars in thousands)
Projects under exploration and development:
Up-front bonus lease costs	$	30,141	$	33,985
Exploration and development costs		38,220		32,302
Interest capitalized		1,278		1,278
		69,639		67,565
Projects under construction:
Up-front bonus lease costs		27,473		29,160
Drilling and construction costs		184,767		283,873
Interest capitalized		6,948		15,543
		219,188		328,576
Total	$	288,827	$	396,141

Rollforward of Construction in Process [Table Text Block]

	Projects under Exploration and Development
	Up-front Bonus Lease Costs			Exploration and Development Costs			Capitalized Interest			Total
	(Dollars in thousands)
Balance at December 31, 2010	$	33,600		$	20,997		$	100		$	54,697
Cost incurred during the year		3,232			19,226			1,498			23,956
Balance at December 31, 2011		36,832			40,223			1,598			78,653
Cost incurred during the year		—			3,782			420			4,202
Write off of unsuccessful exploration costs		(1,160	)		(1,479	)		—			(2,639	)
Reclassification of exploration and development projects to drilling and construction		(1,687	)		(10,224	)		(740	)		(12,651	)
Balance at December 31, 2012		33,985			32,302			1,278			67,565
Cost incurred during the year		—			6,168			—			6,168
Write off of unsuccessful exploration costs		(3,844	)		(250	)		—			(4,094	)
Reclassification of exploration and development
Balance at December 31, 2013	$	30,141		$	38,220		$	1,278		$	69,639

	Projects under Construction
	Up-front Bonus Lease Costs			Drilling and Construction Costs			Capitalized Interest			Total
	(Dollars in thousands)
Balance at December 31, 2010	$	31,179		$	176,968		$	7,790		$	215,937
Cost incurred during the year		-			242,066			10,207			252,273
Reclassification of exploration and development
Reclassification of completed projects to property, plant and equipment		-			(172,156	)		(4,156	)		(176,312	)
Balance at December 31, 2011		31,179			246,878			13,841			291,898
Cost incurred during the year		-			216,894			11,541			228,435
Reclassification of exploration and development projects to drilling and construction		1,687			10,224			740			12,651
Reclassification of completed projects to property, plant and equipment		(3,706	)		(190,123	)		(10,579	)		(204,408	)
Balance at December 31, 2012		29,160			283,873			15,543			328,576
Cost incurred during the year		-			203,859			7,609			211,468
Reclassification of exploration and development
Reclassification of completed projects to property, plant and equipment		(1,687	)		(302,966	)		(16,204	)		320,857
Balance at December 31, 2013	$	27,473		$	184,766		$	6,948		$	219,188