Note 7 - Lease Obligations - Additional Information (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)
Operating cash flows from operating leases	$ 11,003	$ 22,004
Operating cash flows from finance leases	431	849
Financing cash flows from finance leases	564	1,082
Operating leases	1,792	7,230
Finance leases	$ 3,910	$ 5,232
Operating leases (Year)	12 years	12 years
Finance leases (Year)	12 years	12 years
Operating leases	3.60%	3.60%
Finance leases	4.90%	4.90%