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Note 7 - Customer and Geographic Information - Receivables Percentage by Major Customers (Details) - Customer Concentration Risk [Member] - Accounts Receivable [Member]
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Customer A [Member]    
Receivables percentage by major customer 50.00% 65.00%
Customer D [Member]    
Receivables percentage by major customer 12.00% [1]
[1] represents less than 10%