Receivables From Broker Dealers and Clearing Organizations and Other Receivables - Other Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Brokers and Dealers [Abstract]
Trailing fees	$ 947	$ 1,086
Accounts receivable for tax and accounting services	686	661
Allowance for doubtful accounts - tax and accounting services	(282)	(286)
Advances to registered representatives	1,383	393
Investment banking receivable	411	357
Advisory fees	483	559
Notes receivable	665	746
Other	1,379	749
Other receivables	$ 5,672	$ 4,265