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Note 11 - Customer and Geographic Information - Revenue Percentage by Major Customers (Details) - Customer Concentration Risk [Member] - Revenue Benchmark [Member]
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Customer A [Member]        
Receivables percentage by major customer 22.00% 38.00% 30.00% 39.00%
Customer B [Member]        
Receivables percentage by major customer 16.00% [1] [1] [1]
[1] represents less than 10%