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Note 3 - Revenue (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018
Revenue from Contract with Customer, Including Assessed Tax	$ 109,652	$ 82,040	$ 217,397	$ 162,207
Cost of Goods and Services Sold, Total	50,439	$ 35,671	100,276	70,565
Increase (Decrease) in Accounts Receivable			2,648	6,914
Increase (Decrease) in Inventories, Total			(389)	(175)
Accounting Standards Update 2014-09 [Member]
Revenue from Contract with Customer, Including Assessed Tax	(200)		100
Cost of Goods and Services Sold, Total	(100)		100
Increase (Decrease) in Accounts Receivable	(200)		$ 2,700
Increase (Decrease) in Inventories, Total	$ 100			$ (1,200)
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 1,500

X

- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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+ References

No definition available.

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+ References

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-SubTopic 10
-Section 45
-Paragraph 28
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-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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