Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Total revenue	$ 93,613	$ 80,770	$ 256,391	$ 234,505
Costs and expenses from operations:
Cost of goods sold (excludes depreciation and amortization)	44,212	35,201	119,960	107,340
Technology and operations	15,372	13,927	45,136	43,423
Sales and marketing	13,759	13,068	40,934	35,712
General and administrative	8,603	7,454	23,846	21,243
Depreciation and amortization	3,199	2,866	9,297	8,433
Other operating expenses (income), net	573	(1)	1,080	128
Total costs and expenses	85,718	72,515	240,253	216,279
Income from operations	7,895	8,255	16,138	18,226
Interest and other income, net	(807)	(775)	(2,549)	(1,737)
Income before provision for income taxes	8,702	9,030	18,687	19,963
Provision for income taxes	2,702	2,543	5,071	5,265
Net income	$ 6,000	$ 6,487	$ 13,616	$ 14,698
Basic income per common share (in usd per share)	$ 0.2	$ 0.21	$ 0.45	$ 0.47
Diluted income per common share (in usd per share)	$ 0.19	$ 0.21	$ 0.43	$ 0.46
Basic weighted average shares outstanding (in shares)	30,388,675	30,605,963	30,497,820	31,243,979
Diluted weighted average shares outstanding	31,464,461	31,513,488	31,617,578	32,193,239
Purchase revenues
Total revenue	$ 53,396	$ 42,809	$ 142,726	$ 128,715
Consignment and other fee revenues
Total revenue	$ 40,217	$ 37,961	$ 113,665	$ 105,790