SEGMENT INFORMATION - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 60,346	$ 51,884	$ 110,425	$ 96,453
Pre-tax income (loss)	(674)	5,610	(6,441)	11,348
Assets	65,933	63,001	65,933	63,001	$ 64,398
Depreciation and amortization	379	286	758	582
Interest	2	4	5	8
Capital expenditures	5	190	50	354
Corporate
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Pre-tax income (loss)	(6,282)	1,041	(12,631)	4,387
Assets	9,660	12,629	9,660	12,629
Depreciation and amortization	135	87	270	178
Interest	0	0	0	0
Capital expenditures	0	166	0	264
Brokerage and Advisory Services | Operating Segments
Segment Reporting Information [Line Items]
Revenues	56,478	48,740	106,034	92,453
Pre-tax income (loss)	3,668	3,470	5,242	6,574
Assets	51,638	46,834	51,638	46,834
Depreciation and amortization	181	154	367	312
Interest	2	4	5	8
Capital expenditures	5	8	44	27
Tax and Accounting Services | Operating Segments
Segment Reporting Information [Line Items]
Revenues	3,868	3,144	4,391	4,000
Pre-tax income (loss)	1,940	1,099	948	387
Assets	4,635	3,538	4,635	3,538
Depreciation and amortization	63	45	121	92
Interest	0	0	0	0
Capital expenditures	$ 0	$ 16	$ 6	$ 63