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Note 9 - Equity-method Investment (Tables) | 3 Months Ended
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Mar. 31, 2016
Consolidated Statement of Operations [Member] |
Notes Tables |
Equity Method Investments [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2016 |  |  | 2015 |
Asset impairments to write investment down to fair value |  | $ | 3,498 |  |  | $ | 4,130 |
Our portion of the partnership’s operating losses |  |  | 2,066 |  |  |  | 1,732 |
Non-cash interest expense related to the amortization of the discounted fair value of future equity contributions |  |  | 92 |  |  |  | 211 |
Tax benefits and credits generated |  |  | 5,945 |  |  |  | 7,250 |
Consolidated Balance Sheet [Member] |
Notes Tables |
Equity Method Investments [Table Text Block] |
|  | March 31, 2016 |  |  | December 31, 2015 |
Carrying value, recorded as a component of other non-current assets |  | $ | 16,721 |  |  | $ | 22,284 |
Present value of obligation associated with future equity contributions, recorded as a component of accrued liabilities and other long-term liabilities |  |  | 16,930 |  |  |  | 22,511 |

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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