CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Oil and natural gas	$ 7,559,000	$ 5,947,000	$ 21,220,000	$ 20,650,000
Contract drilling	490,000	1,599,000	2,871,000	4,882,000
Sale of interest in leasehold land, net	681,000	1,128,000	1,245,000	3,347,000
Sale of development rights, net			2,497,000	2,497,000
Gain from drilling royalty credits	98,000		1,424,000
Gas processing and other	161,000	105,000	332,000	328,000
Total revenues	8,989,000	8,779,000	29,589,000	31,704,000
Costs and expenses:
Oil and natural gas operating	2,965,000	2,659,000	8,445,000	7,518,000
Contract drilling operating	833,000	1,819,000	3,044,000	4,203,000
General and administrative	1,201,000	1,591,000	7,334,000	6,001,000
Depletion, depreciation, and amortization	2,461,000	2,163,000	7,334,000	6,817,000
Reduction of carrying value of assets			311,000	798,000
Interest expense	242,000	326,000	862,000	906,000
Total costs and expenses	7,702,000	8,558,000	27,330,000	26,243,000
Earnings before income taxes	1,287,000	221,000	2,259,000	5,461,000
Income tax provision (benefit)	400,000	(282,000)	1,279,000	852,000
Net earnings	887,000	503,000	980,000	4,609,000
Less: Net earnings attributable to non-controlling interests	85,000	189,000	556,000	853,000
Net earnings attributable to Barnwell Industries, Inc.	$ 802,000	$ 314,000	$ 424,000	$ 3,756,000
Basic net earnings per common share attributable to Barnwell Industries, Inc. stockholders (in dollars per share)	$ 0.10	$ 0.04	$ 0.05	$ 0.45
Diluted net earnings per common share attributable to Barnwell Industries, Inc. stockholders (in dollars per share)	$ 0.10	$ 0.04	$ 0.05	$ 0.45
Weighted-average number of common shares outstanding:
Basic (in shares)	8,277,160	8,277,160	8,277,160	8,272,732
Diluted (in shares)	8,381,762	8,277,160	8,337,633	8,272,732