Consolidated Balance Sheets (USD $)	Jun. 30, 2013	Sep. 30, 2012
Current assets:
Cash and cash equivalents	$ 42,040,000	$ 57,373,000
Short-term investments	18,000,000	4,000,000
Accounts receivable, net of allowance for doubtful accounts of $250,000 at June 30, 2013 and September 30, 2012	47,384,000	53,719,000
Prepaid expenses and other assets	2,407,000	762,000
Current deferred tax asset	2,198,000	1,925,000
Total current assets	112,029,000	117,779,000
Property, plant and equipment	327,698,000	326,030,000
Less accumulated depreciation	(147,654,000)	(164,634,000)
Net property, plant and equipment	180,044,000	161,396,000
Total assets	292,073,000	279,175,000
Current liabilities:
Accounts payable	12,881,000	18,544,000
Accrued liabilities:
Payroll costs and other taxes	3,193,000	1,802,000
Other	6,716,000	6,425,000
Deferred revenue	1,710,000	3,467,000
Current maturities of notes payable and obligations under capital leases	10,614,000	9,131,000
Total current liabilities	35,114,000	39,369,000
Long-term liabilities:
Notes payable and obligations under capital leases less current maturities	4,835,000	11,179,000
Deferred tax liability	35,986,000	27,678,000
Total long-term liabilities	40,821,000	38,857,000
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, 8,067,132 and 8,031,369 shares issued and outstanding at June 30, 2013 and September 30, 2012, respectively	2,689,000	2,677,000
Additional paid-in capital	95,131,000	93,224,000
Retained earnings	118,318,000	105,048,000
Total stockholders' equity	216,138,000	200,949,000
Total liabilities and stockholders' equity	$ 292,073,000	$ 279,175,000