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Note 2 - Significant Accounting Policies - Intangible Asset Useful Life (Details) | 12 Months Ended
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Dec. 31, 2017
Minimum [Member] |
Depreciation term (Year) | 4 years
Maximum [Member] |
Depreciation term (Year) | 15 years
Technology-Based Intangible Assets [Member] |
Depreciation term (Year) | 2 years
Brand [Member] |
Depreciation term (Year) | 7 years
Customer Relationships [Member] | Minimum [Member] |
Depreciation term (Year) | 4 years
Customer Relationships [Member] | Maximum [Member] |
Depreciation term (Year) | 7 years
Network Rights [Member] |
Depreciation term (Year) | 15 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |