Note 7 - Customer and Geographic Information - Revenue Percentage by Major Customers (Details) - Sales Revenue, Net [Member] - Customer Concentration Risk [Member]	3 Months Ended				6 Months Ended
	Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2016		Jun. 30, 2015
Customer A [Member]
Receivables percentage by major customer	39.00%		54.00%		44.00%		49.00%
Customer B [Member]
Receivables percentage by major customer		[1]	16.00%			[1]	13.00%
Customer C [Member]
Receivables percentage by major customer		[1]		[1]	12.00%		17.00%
Customer D [Member]
Receivables percentage by major customer	13.00%			[1]		[1]		[1]

[1] represents less than 10%