Consolidated Balance Sheets (USD $)	Jun. 30, 2012	Sep. 30, 2011
Current assets:
Cash and cash equivalents	$ 48,739,000	$ 26,077,000
Short-term investments	2,750,000
Accounts receivable, net of allowance for doubtful accounts of $250,000 and $155,000 at June 30, 2012 and September 30, 2011, respectively	56,017,000	86,716,000
Prepaid expenses and other assets	5,037,000	4,254,000
Current deferred tax asset	2,222,000	1,236,000
Total current assets	114,765,000	118,283,000
Property, plant and equipment	321,095,000	302,647,000
Less accumulated depreciation	(156,379,000)	(156,106,000)
Net property, plant and equipment	164,716,000	146,541,000
Total assets	279,481,000	264,824,000
Current liabilities:
Accounts payable	26,593,000	18,732,000
Accrued liabilities:
Payroll costs and other taxes	2,569,000	1,436,000
Other	6,324,000	9,230,000
Deferred revenue	4,320,000	9,616,000
Current maturities of note payable and obligations under capital leases	5,866,000	5,290,000
Total current liabilities	45,672,000	44,304,000
Long-term liabilities:
Note payable and obligations under capital leases less current maturities	7,066,000	10,281,000
Deferred tax liability	27,397,000	22,076,000
Total long-term liabilities	34,463,000	32,357,000
Stockholders' equity:
Preferred stock-par value $1.00 per share; 5,000,000 shares authorized, none outstanding
Common stock-par value $.33 1/3 per share; 50,000,000 shares authorized, 8,031,369 and 7,910,885 shares issued and outstanding at June 30, 2012 and September 30, 2011, respectively	2,677,000	2,637,000
Additional paid-in capital	92,773,000	91,591,000
Retained earnings	103,896,000	93,935,000
Total stockholders' equity	199,346,000	188,163,000
Total liabilities and stockholders' equity	$ 279,481,000	$ 264,824,000