Note 8 - Revolving Lines Of Credit And Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012
Debt Instrument, Basis Spread on Variable Rate	2.00%
Canada [Member]
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars)	5
United States [Member]
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars)	30
Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.15%
Letter of Credit [Member]
Debt Instrument, Basis Spread on Variable Rate	0.25%