Note 7 - Lease Obligations - Lease Cost (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Mar. 31, 2020	Mar. 31, 2020
Total lease cost		$ 13,693	$ 26,930
Cost of Sales [Member]
Operating lease cost		10,586	21,252
Variable lease cost	[1]	1,367	2,605
Store Expenses [Member]
Operating lease cost		79	159
Depreciation of right-of-use assets	[2]	726	1,487
Short-term lease cost		443	528
Sublease income		(92)	(185)
General and Administrative Expense [Member]
Operating lease cost		77	159
Pre-opening Costs and Relocation Expenses [Member]
Operating lease cost		122	122
Interest Expense [Member]
Interest on lease liabilities	[2]	$ 385	$ 803

[1] Immaterial balances related to corporate headquarters and distribution center are included in administrative expenses and store expenses, respectively.

[2] Immaterial balances related to stores not yet open are included in pre-opening and relocation expenses.