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Note 23 - Quarterly Financial Information (Unaudited) | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Quarterly Financial Information [Text Block] | NOTE 23 — QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
|  | Three Months Ended |
|  | Mar. 31, 2016 |  |  | June 30, 2016 |  |  | Sept. 30, 2016 |  |  | Dec. 31, 2016 |  |  | Mar. 31, 2017 |  |  | June 30, 2017 |  |  | Sept. 30, 2017 |  |  | Dec. 31, 2017 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (As restated) |  |  | (As restated) |  |  | (As restated) |
|  | (Dollars in thousands, except per share amounts) |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electricity |  | $ | 107,868 |  |  | $ | 104,001 |  |  | $ | 109,795 |  |  | $ | 114,628 |  |  | $ | 115,776 |  |  | $ | 111,777 |  |  | $ | 112,273 |  |  | $ | 128,503 |
Product |  |  | 43,726 |  |  |  | 55,860 |  |  |  | 74,822 |  |  |  | 51,891 |  |  |  | 74,122 |  |  |  | 67,587 |  |  |  | 44,912 |  |  |  | 37,862 |
Total revenues |  |  | 151,594 |  |  |  | 159,861 |  |  |  | 184,617 |  |  |  | 166,519 |  |  |  | 189,898 |  |  |  | 179,364 |  |  |  | 157,185 |  |  |  | 166,365 |
Cost of revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electricity |  |  | 63,686 |  |  |  | 62,243 |  |  |  | 66,481 |  |  |  | 69,163 |  |  |  | 66,036 |  |  |  | 65,439 |  |  |  | 65,774 |  |  |  | 75,017 |
Product |  |  | 24,035 |  |  |  | 31,822 |  |  |  | 43,647 |  |  |  | 30,719 |  |  |  | 49,452 |  |  |  | 43,432 |  |  |  | 32,218 |  |  |  | 26,992 |
Total cost of revenues |  |  | 87,721 |  |  |  | 94,065 |  |  |  | 110,128 |  |  |  | 99,882 |  |  |  | 115,488 |  |  |  | 108,871 |  |  |  | 97,992 |  |  |  | 102,009 |
Gross margin |  |  | 63,873 |  |  |  | 65,796 |  |  |  | 74,489 |  |  |  | 66,637 |  |  |  | 74,410 |  |  |  | 70,493 |  |  |  | 59,193 |  |  |  | 64,356 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  | 349 |  |  |  | 595 |  |  |  | 1,086 |  |  |  | 732 |  |  |  | 602 |  |  |  | 1,050 |  |  |  | 716 |  |  |  | 789 |
Selling and marketing expenses |  |  | 3,675 |  |  |  | 3,668 |  |  |  | 4,793 |  |  |  | 4,288 |  |  |  | 4,363 |  |  |  | 4,090 |  |  |  | 3,630 |  |  |  | 3,517 |
General and administrative expenses |  |  | 8,749 |  |  |  | 8,783 |  |  |  | 19,093 |  |  |  | 10,085 |  |  |  | 9,949 |  |  |  | 12,201 |  |  |  | 10,877 |  |  |  | 9,854 |
Write-off of unsuccessful exploration activities |  |  | 557 |  |  |  | 863 |  |  |  | 1,294 |  |  |  | 303 |  |  |  | -- |  |  |  | -- |  |  |  | -- |  |  |  | 1,796 |
Operating income |  |  | 50,543 |  |  |  | 51,887 |  |  |  | 48,223 |  |  |  | 51,229 |  |  |  | 59,496 |  |  |  | 53,152 |  |  |  | 43,970 |  |  |  | 48,400 |
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  | 320 |  |  |  | 245 |  |  |  | 266 |  |  |  | 140 |  |  |  | 244 |  |  |  | 362 |  |  |  | 255 |  |  |  | 127 |
Interest expense, net |  |  | (16,023 | ) |  |  | (18,401 | ) |  |  | (17,137 | ) |  |  | (15,828 | ) |  |  | (14,923 | ) |  |  | (14,540 | ) |  |  | (11,692 | ) |  |  | (12,987 | )
Derivatives and foreign currency transaction gains (losses) |  |  | 1,962 |  |  |  | (4,332 | ) |  |  | (222 | ) |  |  | (2,942 | ) |  |  | 1,338 |  |  |  | 1,703 |  |  |  | (1,001 | ) |  |  | 614 |
Income attributable to sale of tax benefits |  |  | 4,398 |  |  |  | 4,519 |  |  |  | 3,463 |  |  |  | 4,123 |  |  |  | 6,157 |  |  |  | 4,356 |  |  |  | 3,506 |  |  |  | 3,859 |
Other non-operating income (expense), net |  |  | 191 |  |  |  | 49 |  |  |  | (5,546 | ) |  |  | (39 | ) |  |  | (92 | ) |  |  | 6 |  |  |  | (1,592 | ) |  |  | 12 |
Income (loss) from continuing operations, before income taxes and equity in income (losses) of investees |  |  | 41,391 |  |  |  | 33,967 |  |  |  | 29,047 |  |  |  | 36,683 |  |  |  | 52,220 |  |  |  | 45,039 |  |  |  | 33,446 |  |  |  | 40,025 |
Income tax benefit (provision) |  |  | (9,079 | ) |  |  | (8,515 | ) |  |  | (12,109 | ) |  |  | (7,356 | ) |  |  | (11,004 | ) |  |  | (32,765 | ) |  |  | (6,224 | ) |  |  | 28,329 |
Equity in income (losses) of investees |  |  | (937 | ) |  |  | (1,144 | ) |  |  | (2,653 | ) |  |  | (3,001 | ) |  |  | (1,599 | ) |  |  | (428 | ) |  |  | 337 |  |  |  | (267 | )
Net income (loss) |  |  | 31,375 |  |  |  | 24,308 |  |  |  | 14,285 |  |  |  | 26,326 |  |  |  | 39,617 |  |  |  | 11,846 |  |  |  | 27,559 |  |  |  | 68,087 |
Net loss (income) attributable to noncontrolling interest |  |  | (1,674 | ) |  |  | (584 | ) |  |  | (2,326 | ) |  |  | (3,002 | ) |  |  | (4,423 | ) |  |  | (3,206 | ) |  |  | (3,599 | ) |  |  | (3,467 | )
Net income (loss) attributable to the Company's stockholders |  | $ | 29,701 |  |  | $ | 23,724 |  |  | $ | 11,959 |  |  | $ | 23,324 |  |  | $ | 35,194 |  |  | $ | 8,640 |  |  | $ | 23,960 |  |  | $ | 64,620 |
Earnings (loss) per share attributable to the Company's stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.60 |  |  | $ | 0.48 |  |  | $ | 0.24 |  |  | $ | 0.47 |  |  | $ | 0.71 |  |  | $ | 0.17 |  |  | $ | 0.48 |  |  | $ | 1.28 |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.60 |  |  | $ | 0.47 |  |  | $ | 0.24 |  |  | $ | 0.46 |  |  | $ | 0.70 |  |  | $ | 0.17 |  |  | $ | 0.47 |  |  | $ | 1.27 |
Weighted average number of shares used in computation of earnings per share attributable to the Company's stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 49,173 |  |  |  | 49,456 |  |  |  | 49,599 |  |  |  | 49,647 |  |  |  | 49,680 |  |  |  | 49,771 |  |  |  | 50,367 |  |  |  | 50,607 |
Diluted |  |  | 49,782 |  |  |  | 50,137 |  |  |  | 50,289 |  |  |  | 50,293 |  |  |  | 50,491 |  |  |  | 50,624 |  |  |  | 50,867 |  |  |  | 51,053 |
As further discussed in Note 1, the Company has restated its previously issued consolidated financial statements as of and for the year ended December 31, 2017 to correct for errors in its previously issued 2017 consolidated financial statements primarily relating to the Company’s ability to utilize Federal tax credits in the U.S. prior to their expiration starting in 2027 and the resulting impact on the Company’s deferred tax asset valuation allowance, and the inappropriate netting of certain deferred income tax assets and liabilities across different tax jurisdictions, which was not permissible under U.S. generally accepted accounting principles. In addition, there were other immaterial prior period errors, including an out-of-period adjustment that had been previously recorded for the correction of an understated liability for unrecognized tax benefits related to intercompany interest. In addition, the Company also concluded that it would revise its previously issued consolidated financial statements as of and for the year ended December 31, 2016 and for the year ended December 31, 2015 to correct for certain other tax errors, including a prior period error related to the translation of deferred tax liabilities in the Company’s Kenyan subsidiary, which were previously determined to be immaterial and which had previously been corrected for as out-of-period adjustments in the period of identification. These error corrections also resulted in the restatement, for 2017 and revision, for 2016, of the Company’s previously issued unaudited condensed consolidated financial statements for the three and six months ended June 30, 2017 and 2016 and the three and nine months ended September 30, 2017 and 2016 which restatements and revisions have been effected through the Company’s filing of amended Form 10 -Q’s. The revision of the Company’s previously issued unaudited condensed consolidated financial statements for the three months ended March 31, 2017 will be effected in connection with the Company’s filing of its Form 10 -Q for the quarter ended March 31, 2018. The impact of the restatement and revision of these unaudited periods, along with the restatement of the financial results for the three months ended December 31, 2017 and the revision of the financial results for the three months ended December 31, 2016, have been reflected within the table above. The restated condensed consolidated financial statements for the three months ended December 31, 2017 reflect a $1.3 million decrease in the income tax benefit, with a corresponding decrease in net income. In addition, the revised condensed consolidated financial statements for the three months ended December 31, 2016 reflect a $4.9 million increase in the tax provision, with a corresponding reduction to net income.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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