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Note 3 - Revenue (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018
Revenue from Contract with Customer, Including Assessed Tax	$ 115,430	$ 88,105	$ 332,827	$ 250,312
Cost of Goods and Services Sold, Total	53,027	$ 38,793	153,303	109,358
Increase (Decrease) in Accounts Receivable			8,993	10,679
Increase (Decrease) in Inventories, Total			(324)	$ 188
Accounting Standards Update 2014-09 [Member]
Revenue from Contract with Customer, Including Assessed Tax	1,300		1,500
Cost of Goods and Services Sold, Total	600		700
Increase (Decrease) in Accounts Receivable	1,300		4,000
Increase (Decrease) in Inventories, Total	$ (600)		$ 1,800
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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-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

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