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Note 9 - Equity-method Investment (Details Textual) - NMTC Program [Member] - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2014 | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2016
Equity Method Investment, Ownership Percentage | 99.90% |  |  |
Payments to Acquire Equity Method Investments | $ 4.1 | $ 5.7 | $ 22.8 | $ 32.6
Equity Method Investment Equity Contribution Obligation | $ 49.8 |  |  |
Equity Method Investment Equity Contribution Obligation Term | 2 years |  |  |

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- Definition Represents the equity contribution obligation associated with an equity method investment. + References No definition available. + Details
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- Definition Represents the equity contribution obligation term associated with an equity method investment. + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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