Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Concentrations (Details Textual)

v3.19.2
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