Note 3 - Receivables from Broker-dealers and Clearing Organizations and Other Receivables - Other Receivables (Details) - USD ($)	Dec. 31, 2020	Sep. 30, 2020
Trailing fees	$ 1,566,000	$ 1,391,000
Accounts receivable for tax and accounting services	864,000	1,009,000
Allowance for doubtful accounts - tax and accounting services	(497,000)	(347,000)
Advances to registered representatives	1,651,000	1,834,000
Investment banking receivable	1,183,000	2,383,000
Advisory fees	291,000	771,000
Notes receivable	1,218,000	1,229,000
Other	4,317,000	4,124,000
Total other receivables, net	$ 10,593,000	$ 12,394,000