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Note 5 - Accounts Receivable and Customer Concentrations - Concentration of Revenue (Details) - Customer Concentration Risk [Member] | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Customer A [Member] | Sales Revenue, Net [Member] |  |
Concentration risk | 13.20% | 22.50%
Customer A [Member] | Accounts Receivable [Member] |  |
Concentration risk | 14.20% | 23.60%
Customer B [Member] | Sales Revenue, Net [Member] |  |
Concentration risk | 28.50% | 2.00%
Customer B [Member] | Accounts Receivable [Member] |  |
Concentration risk | 52.20% | 28.90%
Customer C [Member] | Sales Revenue, Net [Member] |  |
Concentration risk | 10.30% | 18.70%
Customer C [Member] | Accounts Receivable [Member] |  |
Concentration risk | 5.20% | 6.40%
Customer D [Member] | Sales Revenue, Net [Member] |  |
Concentration risk | 3.60% | 3.90%
Customer D [Member] | Accounts Receivable [Member] |  |
Concentration risk | 3.20% | 11.60%

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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=64851502&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=73719730&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=64851502&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=73719730&loc=d3e13537-108611 + Details
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