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Note 5 - Derivative Instruments and Hedging Activities - Foreign Currency Forward Contracts (Details)	Mar. 31, 2018 USD ($)
Notional amount of U.S. dollars	$ 12,779,952
Weighted average exchange rate of U.S. dollars	1.2875
Fair value	$ 26,103
Foreign Exchange Forward 1 [Member]
Notional amount of U.S. dollars	$ 3,176,805
Weighted average exchange rate of U.S. dollars	1.2919
Fair value	$ 7,737
Foreign Exchange Forward 2 [Member]
Notional amount of U.S. dollars	$ 3,394,161
Weighted average exchange rate of U.S. dollars	1.2893
Fair value	$ 7,165
Foreign Exchange Forward 3 [Member]
Notional amount of U.S. dollars	$ 1,604,112
Weighted average exchange rate of U.S. dollars	1.2873
Fair value	$ 3,421
Foreign Exchange Forward 4 [Member]
Notional amount of U.S. dollars	$ 1,639,448
Weighted average exchange rate of U.S. dollars	1.2852
Fair value	$ 3,192
Foreign Exchange Forward 5 [Member]
Notional amount of U.S. dollars	$ 1,599,200
Weighted average exchange rate of U.S. dollars	1.2831
Fair value	$ 2,788
Foreign Exchange Forward 6 [Member]
Notional amount of U.S. dollars	$ 1,366,226
Weighted average exchange rate of U.S. dollars	1.2809
Fair value	$ 1,800

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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X

- Definition

Average contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

+ Details

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X

- 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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- Details

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