EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Net Earnings (Numerator)
Basic	$ 1,263	$ 672
Diluted	$ 1,263	$ 672
Shares (Denominator)
Basic (in shares)	8,277,160	8,277,160
Effect of dilutive securities-common stock options (in shares)	0	1,132
Diluted (in shares)	8,277,160	8,278,292
Per-Share Amount
Basic net earnings per common share attributable to Barnwell Industries, Inc. stockholders (in dollars per share)	$ 0.15	$ 0.08
Diluted net earnings per share (in dollars per share)	$ 0.15	$ 0.08
Options
Antidilutive shares of common stock excluded from the computation of diluted shares
Antidilutive shares excluded from computation of earnings per share (in shares)	621,250	807,250