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Note 16 - Major Customers and Accounts Receivables (Details Textual) - Customer Concentration Risk [Member] | 3 Months Ended | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Revenue Benchmark [Member] |  |  |
Concentration Risk, Number of Major Customers | 3 | 2 |
Revenue Benchmark [Member] | Three Customers [Member] |  |  |
Concentration Risk, Percentage | 71.00% |  |
Revenue Benchmark [Member] | Two Customers [Member] |  |  |
Concentration Risk, Percentage |  | 56.00% |
Current Accounts Receivable [Member] |  |  |
Concentration Risk, Number of Major Customers | 2 |  | 3
Current Accounts Receivable [Member] | Two Customers [Member] |  |  |
Concentration Risk, Percentage | 37.00% |  |
Current Accounts Receivable [Member] | Customer A [Member] |  |  |
Concentration Risk, Percentage |  |  | 18.00%
Current Accounts Receivable [Member] | Customer B [Member] |  |  |
Concentration Risk, Percentage |  |  | 16.00%
Current Accounts Receivable [Member] | Customer C [Member] |  |  |
Concentration Risk, Percentage |  |  | 14.00%

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 2: 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 3: 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=121572278&loc=d3e13531-108611 Reference 4: 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=121572278&loc=d3e13537-108611 Reference 5: 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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