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Note 11 - Segment Information, Significant Customers, Industry Concentration and Geographic Areas (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

		Year ended December 31,
		2018								2017								2016
		(in thousands)
		Amount				Percent				Amount				Percent				Amount				Percent
United States - domestic shipments		$	302,754				56.8			$	255,197				58.3			$	251,390				58.1
Shipments to or from Mexico			229,350				43.0				181,099				41.4				181,159				41.9
Shipments to or from Canada			1,157				0.2				1,542				0.3				303				-
Total Operating Revenues		$	533,261				100	%			437,838				100	%		$	432,852				100	%

X

- Definition

Tabular disclosure of all significant reconciling items in the reconciliation of total revenues from reportable segments to the entity's consolidated revenues.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8924-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599

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- References

No definition available.

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