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Note 7 - Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments in the Consolidated Balance Sheets (Details) - Derivative Instruments [Member] - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Foreign currency forward contracts |  | $ 172,888
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |
Foreign currency forward contracts |  | 155,560
Not Designated as Hedging Instrument [Member] |  |
Foreign currency forward contracts |  | $ 17,328

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- Definition Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
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Balance Type: |
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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: |