INTANGIBLE ASSETS - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 8,236	$ 8,025
Accumulated Amortization	2,518	2,321
Carrying Value	$ 5,718	5,704
Estimated Useful Life (years)	3 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 7,180	6,969
Accumulated Amortization	2,222	2,025
Carrying Value	$ 4,958	$ 4,944
Customer relationships | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (years)	3 years	7 years
Customer relationships | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (years)	10 years	10 years
Non-compete
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 296	$ 296
Accumulated Amortization	296	296
Carrying Value	$ 0	$ 0
Estimated Useful Life (years)	2 years	2 years
Gilman brand name
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 760	$ 760
Carrying Value	$ 760	$ 760