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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%