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(LOSS) EARNINGS PER COMMON SHARE (Tables)
 12 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Reconciliations between net (loss) earnings attributable to stockholders and common shares outstanding of the basic and diluted net (loss) earnings per share computations
Reconciliations between net (loss) earnings attributable to Barnwell stockholders and common shares outstanding of the basic and diluted net (loss) earnings per share computations are detailed in the following tables:
 Year ended September 30, 2023
 Net LossSharesPer-Share
 (Numerator)(Denominator)Amount
Basic net loss
$(961,000)9,969,856 $(0.10)
Effect of dilutive securities - common stock options and restricted stock units— —  
Diluted net loss
$(961,000)9,969,856 $(0.10)
 Year ended September 30, 2022
 Net EarningsSharesPer-Share
 (Numerator)(Denominator)Amount
Basic net earnings
$5,513,000 9,732,936 $0.57 
Effect of dilutive securities - common stock options— —  
Diluted net earnings
$5,513,000 9,732,936 $0.57