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Note 5 - Income Taxes (Details) - Changes in the Valuation Allowance - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Balance at beginning of year | $ (32,094) | $ (27,155) | $ (23,030)
Balance at end of year | (115,806) | (32,094) | (27,155)
Increase Due to Uncertainty of Recovery [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Valuation allowance deferred tax asset | (92,393) | (6,314) | (3,870)
Decrease Related to Utilization and Expiration [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Valuation allowance deferred tax asset | $ 8,681 | $ 1,375 | $ (255)

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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