Note 7 - Segment and Geographic Information (Details) - Customers with Sales Greater than 10% (Customer Concentration Risk [Member])	3 Months Ended			12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Customer A [Member] | Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Major customer	25.00%		26.00%
Customer A [Member] | Accounts Receivable [Member]
Revenue, Major Customer [Line Items]
Major customer	26.00%			31.00%
Customer B [Member] | Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Major customer		[1]	10.00%
Customer B [Member] | Accounts Receivable [Member]
Revenue, Major Customer [Line Items]
Major customer	14.00%			10.00%

[1] Represents less than 10%.