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Note 5 - Accounts Receivable and Customer Concentrations - Concentration of Revenue (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Customer A [Member] | Sales Revenue, Net [Member]
Concentration risk	9.30%	13.20%
Customer A [Member] | Accounts Receivable [Member]
Concentration risk	15.20%	14.20%
Customer B [Member] | Sales Revenue, Net [Member]
Concentration risk	26.60%	28.50%
Customer B [Member] | Accounts Receivable [Member]
Concentration risk	25.80%	52.20%
Customer C [Member] | Sales Revenue, Net [Member]
Concentration risk	11.90%	10.30%
Customer C [Member] | Accounts Receivable [Member]
Concentration risk	9.00%	5.20%
Customer D [Member] | Sales Revenue, Net [Member]
Concentration risk	11.30%	6.40%
Customer D [Member] | Accounts Receivable [Member]
Concentration risk	7.60%	5.90%

X

- 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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