Note 10 - Derivative Financial Instruments (Details Textual) - USD ($) $ in Thousands	Aug. 31, 2016	Sep. 30, 2015
Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Derivative, Fixed Interest Rate	1.25%
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, Average Fixed Interest Rate	1.91%
Interest Rate Swap [Member] | Effective October 1, 2014 through September 30, 2015 [Member]
Derivative, Amount of Hedged Item		$ 155,000
Interest Rate Swap [Member] | Effective October 1, 2015 through September 30, 2016 [Member]
Derivative, Amount of Hedged Item	$ 70,000
Interest Rate Swap [Member]
Derivative, Amount of Hedged Item	70,000
Interest Expense [Member]
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	$ 40