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Note 11 - Concentrations (Details Textual) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 | Sep. 30, 2019 USD ($) | Sep. 30, 2018 | Dec. 31, 2018 USD ($)
Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 10,000 |  | $ 10,000 |  | $ 10,000
Milestone China [Member] |  |  |  |  |
Accounts Receivable, before Allowance for Credit Loss | $ 1,817,990 |  | 1,817,990 |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  |  |  |  | 1,817,990
Accounts Receivable, Credit Loss Expense (Reversal) |  |  | $ 1,250,928 |  | $ 1,250,928
Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk, Percentage |  | 44.00% |  | 43.00% |
Number of Customers |  | 1 |  | 1 |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |  |  |  |
Concentration Risk, Percentage | 54.00% |  | 51.00% |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Number of Customers |  |  | 2 |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Two Customers [Member] |  |  |  |  |
Accounts Receivable, before Allowance for Credit Loss | $ 2.70 |  | $ 2.70 |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Milestone China [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 91.00% |  | 82.00%
Accounts Receivable, before Allowance for Credit Loss |  |  |  |  | $ 3.10
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer One [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 59.00% |  | 49.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Two [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 32.00% |  | 33.00%

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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=118952595&loc=d3e4428-111522 + Details
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