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Note 11 - Concentrations (Details Textual) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 | Jun. 30, 2019 USD ($) | Jun. 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 |  | $ 1,817,990 |  |
Accounts Receivable, Credit Loss Expense (Reversal) |  |  |  |  | $ 1,250,928
Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk, Percentage |  | 44.00% |  | 43.00% |
Number of Customers | 1 | 1 | 1 | 1 |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |  |  |  |
Concentration Risk, Percentage | 52.00% | 52.00% | 50.00% | 50.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Number of Customers |  |  | 2 |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Two Customers [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 82.00% |  |
Accounts Receivable, before Allowance for Credit Loss | $ 2,850,461 |  | $ 2,850,461 |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer One [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 52.00% |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Two [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 30.00% |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Milestone China [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 78.00%
Accounts Receivable, before Allowance for Credit Loss |  |  |  |  | $ 2,555,000

X
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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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