Note 13 - Employee Stock Option and Retirement Plans (Details) - Change in the Actual Financial Performance Level (USD $) In Thousands, unless otherwise specified	9 Months Ended
	May 31, 2014
Note 13 - Employee Stock Option and Retirement Plans (Details) - Change in the Actual Financial Performance Level [Line Items]
Total unamortized stock-based compensation expense	$ 2,800
Financial Performance Level One [Member] | November 2012 Annual Employee Performance-Based Option Grant Review [Member]
Note 13 - Employee Stock Option and Retirement Plans (Details) - Change in the Actual Financial Performance Level [Line Items]
Vesting percentage	0.00%
Total unamortized stock-based compensation expense	0
One-time adjustment	(2,265)	[1]
Average remaining quarterly expense to be recognized	0
Financial Performance Level Two [Member] | November 2012 Annual Employee Performance-Based Option Grant Review [Member]
Note 13 - Employee Stock Option and Retirement Plans (Details) - Change in the Actual Financial Performance Level [Line Items]
Vesting percentage	20.00%
Total unamortized stock-based compensation expense	2,483
One-time adjustment	0	[1]
Average remaining quarterly expense to be recognized	182
Financial Performance Level Three [Member] | November 2012 Annual Employee Performance-Based Option Grant Review [Member]
Note 13 - Employee Stock Option and Retirement Plans (Details) - Change in the Actual Financial Performance Level [Line Items]
Vesting percentage	60.00%
Total unamortized stock-based compensation expense	7,449
One-time adjustment	4,530	[1]
Average remaining quarterly expense to be recognized	545
Financial Performance Level Four [Member] | November 2012 Annual Employee Performance-Based Option Grant Review [Member]
Note 13 - Employee Stock Option and Retirement Plans (Details) - Change in the Actual Financial Performance Level [Line Items]
Vesting percentage	100.00%
Total unamortized stock-based compensation expense	12,415
One-time adjustment	9,060	[1]
Average remaining quarterly expense to be recognized	$ 908

[1] Amounts represent the cumulative catch-up adjustment to be recorded if there was a change in the vesting percentage as of May 31, 2014.