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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, 2018 | Dec. 31, 2017
Customer A [Member] | Sales Revenue, Net [Member] |  |
Concentration risk | 4.90% | 9.30%
Customer A [Member] | Accounts Receivable [Member] |  |
Concentration risk | 4.80% | 15.20%
Customer B [Member] | Sales Revenue, Net [Member] |  |
Concentration risk | 13.20% | 26.60%
Customer B [Member] | Accounts Receivable [Member] |  |
Concentration risk | 13.90% | 25.80%
Customer C [Member] | Sales Revenue, Net [Member] |  |
Concentration risk | 7.20% | 11.90%
Customer C [Member] | Accounts Receivable [Member] |  |
Concentration risk | 4.00% | 9.00%
Customer D [Member] | Sales Revenue, Net [Member] |  |
Concentration risk | 3.80% | 11.30%
Customer D [Member] | Accounts Receivable [Member] |  |
Concentration risk | 0.10% | 7.60%
Customer E [Member] |  |
Concentration risk | 40.10% |
Customer E [Member] | Sales Revenue, Net [Member] |  |
Concentration risk | 52.60% |
Customer E [Member] | Accounts Receivable [Member] |  |
Concentration risk |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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