Note 25 - Quarterly FInancial Information (Unaudited)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

NOTE 25 — QUARTERLY FINANCIAL INFORMATION (UNAUDITED)

	Three Months Ended
	Mar. 31, 2014			June 30, 2014			Sept. 30, 2014			Dec. 31, 2014			Mar. 31, 2015			June 30, 2015			Sept. 30, 2015			Dec. 31, 2015
	(Dollars in thousands, except per share amounts)
Revenues:
Electricity	$	94,817		$	91,692		$	102,506		$	93,286		$	89,953		$	90,926		$	97,245		$	97,796
Product		47,619			35,911			37,736			55,957			30,278			49,561			65,607			73,278
Total revenues		142,436			127,603			140,242			149,243			120,231			140,487			162,852			171,074
Cost of revenues:
Electricity		57,034			67,322			61,727			60,547			55,581			62,522			61,501			63,008
Product		31,943			20,324			23,040			33,836			20,625			27,182			42,019			43,927
Total cost of revenues		88,977			87,646			84,767			94,383			76,206			89,704			103,520			106,935
Gross margin		53,459			39,957			55,475			54,860			44,025			50,783			59,332			64,139
Operating expenses:
Research and development expenses		(87	)		232			250			388			363			414			335			668
Selling and marketing expenses		3,379			3,216			4,258			4,572			3,433			4,283			4,383			3,978
General and administrative expenses		7,596			6,072			7,179			7,767			10,204			7,443			7,950			9,185
Write-off of unsuccessful exploration activities		--			8,107			--			7,332			174			--			185			1,220
Operating income		42,571			22,330			43,788			34,801			29,851			38,643			46,479			49,088
Other income (expense):
Interest income		111			90			35			76			9			44			53			191
Interest expense, net		(20,518	)		(22,072	)		(22,494	)		(19,570	)		(17,828	)		(18,859	)		(17,748	)		(18,142	)
Foreign currency translation and transaction gains (losses)		(638	)		(55	)		(2,946	)		(2,200	)		(1,366	)		(571	)		1,296			(981	)
Income attributable to sale of tax benefits		6,717			6,130			5,487			5,809			5,552			4,731			8,634			6,514
Gain from sale of property, plant and equipment					7,628			--			--			--			--			--			--
Other non-operating income (expense), net		63			343			243			107			283			(1,675	)		(131	)		(468	)
Income (loss) from continuing operations, before income taxes and equity in income of investees		28,306			14,394			24,113			19,023			16,501			22,313			38,583			36,202
Income tax benefit (provision)		(6,320	)		(4,967	)		(6,444	)		(9,877	)		(5,459	)		(6,056	)		38,211			(11,438	)
Equity in income (losses) of investees		(197	)		(114	)		(899	)		(2,003	)		(775	)		(984	)		(3,133	)		(616	)
Income (loss) from continuing operations		21,789			9,313			16,770			7,143			10,267			15,273			73,661			24,148
Discontinued operations:
Income from discontinued operations (including gain on disposal of $0, $3,646, $0, $0, $0, $0, $0, and $0, respectively)		--			--			--			--			--			--			--			--
Income tax provision		--			--			--			--			--			--			--			--
Total income from discontinued operations		--			--			--			--			--			--
Net income (loss)		21,789			9,313			16,770			7,143			10,267			15,273			73,661			24,148
Net loss (income) attributable to noncontrolling interest		(237	)		(177	)		(256	)		(163	)		(235	)		(859	)		(1,522	)		(1,160	)
Net income (loss) attributable to the Company's stockholders	$	21,552		$	9,136		$	16,514		$	6,980		$	10,032		$	14,414		$	72,139		$	22,988
Earnings (loss) per share attributable to the Company's stockholders
Basic:
Net income	$	0.47		$	0.20		$	0.37		$	0.15		$	0.21		$	0.29		$	1.47		$	0.47
Diluted:
Net income	$	0.47		$	0.20		$	0.36		$	0.15		$	0.21		$	0.28		$	1.41		$	0.46
Weighted average number of shares used in computation of earnings per share attributable to the Company's stockholders:
Basic		45,479			45,606			45,690			45,537			47,244			48,881			49,023			49,074
Diluted		45,660			45,963			46,102			46,018			48,079			50,600			51,113			49,668