Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 3,231,000	$ (1,667,000)
Adjustments to reconcile net income (loss) to net cash (used) provided by operating activities:
Depreciation	7,786,000	7,132,000
Noncash compensation	466,000	595,000
Deferred income tax (benefit) expense	(263,000)	4,708,000
Provision for bad debts	95,000	23,000
Other	24,000	(423,000)
Change in current assets and liabilities:
Increase in accounts receivable	(3,547,000)	(1,907,000)
Increase in prepaid expenses and other assets	(1,140,000)	(6,061,000)
Increase (decrease) in accounts payable	1,945,000	(1,638,000)
Decrease in accrued liabilities	(2,581,000)	(9,000)
(Decrease) increase in deferred revenue	(7,514,000)	2,461,000
Net cash (used) provided by operating activities	(1,498,000)	3,214,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures, net of noncash capital expenditures summarized below in noncash investing activities	(9,519,000)	(17,830,000)
Proceeds from maturity of short-term investments		10,000,000
Acquisition of short-term investments		(2,500,000)
Proceeds from disposal of assets	38,000	606,000
Partial proceeds on fire insurance claim		758,000
Net cash used in investing activities	(9,481,000)	(8,966,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments on note payable	(1,740,000)
Proceeds from exercise of stock options	57,000	74,000
Net cash (used) provided by financing activities	(1,683,000)	74,000
Net decrease in cash and cash equivalents	(12,662,000)	(5,678,000)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	26,077,000	29,675,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD	13,415,000	23,997,000
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest expense	202,000
Cash paid for income taxes	1,000
Cash received for income taxes	28,000	202,000
NONCASH INVESTING ACTIVITIES:
Accrued purchases of property and equipment	2,636,000	10,000,000
Unrealized loss on investments		$ (2,000)