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Note 4 - Net Sales (Details Textual) $ in Millions | Jan. 01, 2018 USD ($)
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Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member] |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 11.2

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- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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: |