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Note 5 - Revenue Recognition (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 16,895   $ 16,895   $ 16,895
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Non-US [Member] | ASI [Member]          
Concentration Risk, Percentage 83.00% 86.00% 74.00% 72.00%  
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Non-US [Member] | Personal Care [Member]          
Concentration Risk, Percentage 17.00% 18.00% 19.00% 18.00%  
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | CHINA | ASI [Member]          
Concentration Risk, Percentage 46.00% 49.00% 50.00% 53.00%