Note 12 - Derivative Financial Instruments (Details Textual) - USD ($) $ in Millions	9 Months Ended
	Feb. 29, 2016	Sep. 30, 2015	Sep. 30, 2014
Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member] | Effective October 1, 2014 through September 30, 2015 [Member]
Derivative, Average Fixed Interest Rate		1.77%
Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member] | Effective October 1, 2015 through September 30, 2016 [Member]
Derivative, Average Fixed Interest Rate	1.91%
Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member]
Derivative, Lower Fixed Interest Rate Range	1.25%
Derivative, Average Fixed Interest Rate		1.91%	1.67%
Interest Rate Swap [Member] | Effective October 1, 2014 through September 30, 2015 [Member]
Derivative, Amount of Hedged Item		$ 155.0
Interest Rate Swap [Member] | Effective October 1, 2015 through September 30, 2016 [Member]
Derivative, Amount of Hedged Item	$ 70.0
Interest Rate Swap [Member]
Derivative, Amount of Hedged Item	70.0		$ 240.0
Interest Expense [Member]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	$ 0.3