Note 7 - Stockholders' Equity and Stock-based Compensation Expense (Details) - Summary of Equity Awards Granted In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Note 7 - Stockholders' Equity and Stock-based Compensation Expense (Details) - Summary of Equity Awards Granted [Line Items]
Stock options	70
Restricted Stock Units (RSUs) [Member]
Note 7 - Stockholders' Equity and Stock-based Compensation Expense (Details) - Summary of Equity Awards Granted [Line Items]
Equity Awards	13

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration