Note 8 - Property and Equipment - Depreciation and Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Depreciation and amortization expense	$ 7,888	$ 7,290	$ 15,595	$ 14,576
Cost of Sales [Member]
Depreciation and amortization expense	194	185	383	367
Stores [Member]
Depreciation and amortization expense	7,393	6,848	14,633	13,690
General and Administrative Expense [Member]
Depreciation and amortization expense	$ 301	$ 257	$ 579	$ 519