Valuation and Qualifying Accounts

12 Months Ended

Sep. 30, 2011

Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

Schedule II

Dawson Geophysical Company

Valuation and Qualifying Accounts

	Balance at Beginning of Period		Charged to Costs and Expenses			Deductions		Balance at End of Period
Allowance for doubtful accounts*:
Fiscal Year:
2011	$	639,000	$	231,000		$	715,000	$	155,000
2010		533,000		256,000			150,000		639,000
2009		55,000		993,000			515,000		533,000
Valuation allowance for deferred tax assets:
Fiscal Year:
2011	$	19,000	$	(19,000	)	$	—	$	—
2010		58,000		(39,000	)		—		19,000
2009		70,000		(12,000	)		—		58,000

* Deductions related to allowance for doubtful accounts represent amounts that have been deemed uncollectible and written off by the Company.