Note 3 - Significant Customers, Concentration of Credit Risk, and Geographic Information (Details Textual) - Customer Concentration Risk [Member]	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Sales Revenue, Net [Member]
Number of Major Customers Concentration Risk	2	2
Sales Revenue, Net [Member] \| Customer 1 [Member]
Concentration Risk, Percentage	20.10%	15.00%
Sales Revenue, Net [Member] \| Customer 2 [Member]
Concentration Risk, Percentage	14.00%	9.40%
Accounts Receivable [Member]
Number of Major Customers Concentration Risk	2	2
Accounts Receivable [Member] \| Customer 1 [Member]
Concentration Risk, Percentage	20.60%	11.40%
Accounts Receivable [Member] \| Customer 2 [Member]
Concentration Risk, Percentage	12.60%	5.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration