Note 19 - Subsequent Events (Detail) In Millions, unless otherwise specified	1 Months Ended
Oct. 31, 2011	Oct. 27, 2011 USD ($)	Sep. 30, 2011 USD ($)	Sep. 30, 2011 CAD	Oct. 31, 2011 Competitive Bid Option [Member] USD ($)	Oct. 31, 2011 Sub-limit [Member] USD ($)
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,750.0	$ 1,500.0	250.0
Debt Instrument, Basis Spread on Variable Rate	1.05%
Line of Credit Facility, Commitment Fee Percentage	0.20%
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases					$ 875.0	$ 500.0

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant