Note 20 - Derivative Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	0 Months Ended		12 Months Ended
	May 18, 2012	Aug. 05, 2011	Feb. 15, 2011	Jun. 24, 2012	Feb. 28, 2015	Aug. 31, 2013	May 31, 2013
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge	5 years	21 months	27 months
Notional Amount of Interest Rate Cash Flow Hedge Derivatives	$ 50,000	$ 10,000	$ 25,000		$ 50,000	$ 5,000	$ 85,000
Line of Credit Facility, Amount Outstanding			25,000
Derivative, Swaption Interest Rate		0.75%	1.39%	1.06%
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)				$ 1,015