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Note 5 - Derivative Instruments and Hedging Activities - Effects of Derivative Instruments on Income and Other Comprehensive Income (OCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating Expense [Member]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (43)	$ (28)	$ (290)	$ (182)
Cost of Sales [Member]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(12)	(7)	(82)	(38)
Amount of Gain or (Loss) Recognized in OCI, Net of Tax, on Derivative (Effective Portion)	762	(149)	1,039	781
Amount of Gain or (Loss) Recognized in OCI, Net of Tax, on Derivative (Effective Portion)	762	(149)	1,039	781
Interest Expense [Member]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(4)	0	(4)	0
Amount of Gain or (Loss) Recognized in OCI, Net of Tax, on Derivative (Effective Portion)	13	0	(141)	0
Amount of Gain or (Loss) Recognized in OCI, Net of Tax, on Derivative (Effective Portion)	$ 13	$ 0	$ (141)	$ 0

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624177-113959

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-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959

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- Definition

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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580

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-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580

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