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Note 4 - Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments in the Consolidated Balance Sheets (Details) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Foreign currency forward contracts | $ 356,525 |
Derivative Instruments [Member] |  |
Foreign currency forward contracts | 356,525 |
Foreign currency forward contracts |  | $ 172,888
Derivative Instruments [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |
Foreign currency forward contracts | 321,248 |
Foreign currency forward contracts |  | 155,560
Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |
Foreign currency forward contracts | $ 35,277 |
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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- Definition Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into. + 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
Name: | us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |