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Note 8 - Significant Customers / Concentration / Disaggregated Revenue - Concentration of Risk (Details) - Customer Concentration Risk [Member] | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Revenue Benchmark [Member] | Customer A [Member] |  |  |  |  |
Concentration Risk, Percentage | 18.00% | 33.00% | 30.00% | 30.00% |
Revenue Benchmark [Member] | Customer B [Member] |  |  |  |  |
Concentration Risk, Percentage | 15.00% |  | 13.00% |  |
Revenue Benchmark [Member] | Customer D [Member] |  |  |  |  |
Concentration Risk, Percentage |  | 10.00% |  | 12.00% |
Revenue Benchmark [Member] | Customer E [Member] |  |  |  |  |
Concentration Risk, Percentage |  | 43.00% |  | 33.00% |
Accounts Receivable [Member] | Customer A [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 26.00% |  | 39.00%
Accounts Receivable [Member] | Customer B [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 25.00% |  | 15.00%
Accounts Receivable [Member] | Customer D [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 11.00% |  |
Accounts Receivable [Member] | Customer C [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 17.00%

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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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