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Note 18 - Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Long-term Purchase Commitment [Table Text Block] |
December 31 |  | Amount
2017 |  |  | 120,464,000 |
2018 |  |  | 36,786,000 |
Total |  |  | 157,250,000 |

X
- Definition Tabular disclosure of key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration