Note 5 - Derivative Instruments (Detail) (De Designated [Member])	1 Months Ended
Feb. 29, 2012
De Designated [Member]
Derivative, Hedge Designation	100 percent

The hedge designation, if any, elected for the derivative.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41620-113959

Name:	us-gaap_DerivativeHedgeDesignation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration