EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income (loss)	$ 5,089	$ 958	$ (2,695)	$ 301	$ (3,330)	$ (5,662)	$ 3,352	$ (8,691)
Denominator:
Weighted average basic shares (in shares)	11,579			11,514			11,567	11,503
Dilutive effect of restricted stock units (in shares)	24			73			22	0
Weighted average diluted shares	11,603			11,587			11,589	11,503
Income (loss) per share:
Basic (in dollars per share)	$ 0.44			$ 0.03			$ 0.29	$ (0.76)
Diluted (in dollars per share)	$ 0.44			$ 0.03			$ 0.29	$ (0.76)