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Note 11 - Business Segments and Significant Customers (Details) - Long-lived Assets by Geographic Area - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Note 11 - Business Segments and Significant Customers (Details) - Long-lived Assets by Geographic Area [Line Items] |  |
Long-lived assets | $ 1,896,811 | $ 1,831,564
UNITED STATES |  |
Note 11 - Business Segments and Significant Customers (Details) - Long-lived Assets by Geographic Area [Line Items] |  |
Long-lived assets | 1,150,521 | 1,081,699
CANADA |  |
Note 11 - Business Segments and Significant Customers (Details) - Long-lived Assets by Geographic Area [Line Items] |  |
Long-lived assets | 741,612 | 749,810
MEXICO |  |
Note 11 - Business Segments and Significant Customers (Details) - Long-lived Assets by Geographic Area [Line Items] |  |
Long-lived assets | $ 4,678 | $ 55

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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