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Note 9 - Segment Information (Details)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Note 9 - Segment Information (Details) [Line Items]
Number of Reportable Segments	2
Chemicals [Member]
Note 9 - Segment Information (Details) [Line Items]
Number of Reportable Segments	2
Geographic Concentration Risk [Member] | MEXICO | Sales Revenue, Goods, Net [Member]
Note 9 - Segment Information (Details) [Line Items]
Concentration Risk, Percentage	2.00%	3.00%
Geographic Concentration Risk [Member] | Other Countries [Member] | Sales Revenue, Goods, Net [Member]
Note 9 - Segment Information (Details) [Line Items]
Concentration Risk, Percentage	1.00%
Geographic Concentration Risk [Member] | Sales Revenue, Goods, Net [Member]
Note 9 - Segment Information (Details) [Line Items]
Concentration Risk, Percentage		1.00%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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