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Note 5 - Derivative Instruments and Hedging Activities - Effects of Derivative Instruments on Income and Other Comprehensive Income (OCI) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Amount of Gain or (Loss) Recognized in OCI, Net of Tax, on Derivative (Effective Portion)	$ 17,425	$ 186,229	[1]
Operating Expense [Member]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		105,355
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Cost of Sales [Member]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		21,128
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Amount of Gain or (Loss) Recognized in OCI, Net of Tax, on Derivative (Effective Portion)		$ 105,609
[1] The Company has initially applied ASC 2014-09 (Topic 606) using the modified retrospective method. Under this method, the comparative information is not restated.

X

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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-Publisher FASB
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-Topic 815
-SubTopic 10
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-Paragraph 4D
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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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