Note 5 - Derivative Instruments and Hedging Activities (Details)					1 Months Ended
	Feb. 28, 2015 USD ($)	Aug. 30, 2014 USD ($)		Feb. 28, 2015 Forward Contracts [Member] Current Accrued Liabilities [Member] USD ($)	Feb. 28, 2015 Forward Contracts [Member] USD ($)	Feb. 28, 2015 Forward Contracts [Member] CAD	Jan. 31, 2015 Forward Contracts [Member] CAD	Jan. 31, 2015 Canadian Dollars to US Dollars [Member]
Note 5 - Derivative Instruments and Hedging Activities (Details) [Line Items]
Derivative, Number of Instruments Held							16
Derivative, Notional Amount (in Dollars)						31,000,000	31,000,000
Derivative, Forward Exchange Rate								0.7825
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value				600,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(21,335,000)	(2,533,000)	[1]		(600,000)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred					$ (600,000)

[1] Derived from audited financial statements