Note 7 - Lease Obligations - Additional Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)
Operating cash flows from operating leases	$ 11,114	$ 33,118
Operating cash flows from finance leases	456	1,305
Financing cash flows from finance leases	587	1,669
Operating leases	0	7,230
Finance leases	$ 0	$ 5,232
Operating leases (Year)	11 years 9 months 18 days	11 years 9 months 18 days
Finance leases (Year)	11 years 9 months 18 days	11 years 9 months 18 days
Operating leases	3.60%	3.60%
Finance leases	4.90%	4.90%