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Note 10 - Significant Customers - Concentration Risk by Risk Factor of Sales Revenue and Accounts Receivable (Details) - Customer Concentration Risk [Member]		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Sales Revenue, Net [Member]
Concentration risk, percentage		16.10%	16.30%	24.60%
Sales Revenue, Net [Member] | Customer A [Member]
Concentration risk, percentage		16.10%	16.30%	14.20%
Sales Revenue, Net [Member] | Customer B [Member]
Concentration risk, percentage	[1]			10.40%
Accounts Receivable [Member]
Concentration risk, percentage		31.30%	25.10%
Accounts Receivable [Member] | Customer A [Member]
Concentration risk, percentage		20.30%	13.40%
Accounts Receivable [Member] | Customer B [Member]
Concentration risk, percentage	[1]	11.00%	11.70%
[1] Sales didn't exceed 10% of the revenue.

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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 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: 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=77997519&loc=d3e13531-108611

Reference 3: 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=84177426&loc=d3e6404-108592

Reference 4: 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=77997519&loc=d3e13537-108611

+ Details

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- Details

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