Note 8 - Income Taxes (Details) - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2013
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits [Abstract]
Beginning balance at January 1, 2013	$ 41
Additions for tax positions related to the current period	23
Ending balance at September 30, 2013	$ 64

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Name:	us-gaap_UnrecognizedTaxBenefits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant