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Note 17 - Major Customers and Accounts Receivable (Details Textual) - Customer Concentration Risk [Member] | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Revenue Benchmark [Member] |  |  |  |  |
Concentration Risk, Number of Major Customers | 1 | 3 | 3 | 2 |
Concentration Risk, Percentage | 28.00% |  |  |  |
Revenue Benchmark [Member] | Three Customers [Member] |  |  |  |  |
Concentration Risk, Percentage |  | 56.00% | 50.00% |  |
Revenue Benchmark [Member] | Two Customers [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 39.00% |
Current Accounts Receivable [Member] |  |  |  |  |
Concentration Risk, Number of Major Customers |  |  | 1 |  | 1
Concentration Risk, Percentage |  |  | 71.00% |  | 70.00%
Non-current Accounts Receivable [Member] | One Customer [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 100.00% |  | 100.00%

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- Definition Represents the number of external customers that accounts for 10 percent or more of an entity's revenues or accounts receivable. + References No definition available. + Details
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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=118260190&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=118260190&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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