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Note 12 - Concentrations (Details Textual) - Customer Concentration Risk [Member] | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2020 USD ($) | Sep. 30, 2019 | Dec. 31, 2019
Revenue Benchmark [Member] | Domestic Distributor [Member] |  |  |  |
Concentration Risk, Percentage |  | 40.00% |  |
Revenue Benchmark [Member] | International Distributor [Member] |  |  |  |
Concentration Risk, Percentage |  |  | 45.00% |
Revenue Benchmark [Member] | One Customer [Member] |  |  |  |
Concentration Risk, Percentage | 54.00% |  | 51.00% |
Accounts Receivable [Member] |  |  |  |
Number of Customers |  | 2 |  |
Accounts Receivable [Member] | Domestic Distributor [Member] |  |  |  |
Concentration Risk, Percentage |  |  |  | 77.00%
Accounts Receivable [Member] | Two Customers [Member] |  |  |  |
Accounts Receivable, before Allowance for Credit Loss |  | $ 720,000 |  |
Accounts Receivable [Member] | Milestone China [Member] |  |  |  |
Concentration Risk, Percentage |  | 74.00% |  |
Accounts Receivable [Member] | Customer One [Member] |  |  |  |
Concentration Risk, Percentage |  | 60.00% |  |
Accounts Receivable [Member] | Customer Two [Member] |  |  |  |
Concentration Risk, Percentage |  | 14.00% |  |

X
- Definition Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc. + References No definition available. + Details
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- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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X
- 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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- Details
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