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Note 7 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Net carrying amount | $ 150,562 |
Franchise Rights [Member] |  |
Gross carrying amount, indefinite-lived intangible assets | 812,371 | $ 812,137
Use Rights [Member] |  |
Gross carrying amount, amortized intangible assets | 3,828 | 4,138
Accumulated amortization | 3,643 | 3,886
Net carrying amount | $ 185 | $ 252
Customer Relationships [Member] |  |
Useful life (Year) | 14 years | 14 years
Gross carrying amount, amortized intangible assets | $ 160,000 | $ 160,000
Accumulated amortization | 10,476 | 7,619
Net carrying amount | $ 149,524 | $ 152,381
Trademarks and Trade Names [Member] |  |
Useful life (Year) | 2 years 255 days | 2 years 255 days
Gross carrying amount, amortized intangible assets | $ 1,300 | $ 1,300
Accumulated amortization | 447 | 325
Net carrying amount | $ 853 | $ 975
Minimum [Member] | Use Rights [Member] |  |
Useful life (Year) | 1 year | 1 year
Maximum [Member] | Use Rights [Member] |  |
Useful life (Year) | 25 years | 25 years

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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X
- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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X
- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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