Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Statements of Operations [Abstract]
Operating revenues	$ 98,033,000	$ 61,178,000	$ 249,023,000	$ 146,093,000
Operating costs:
Operating expenses	85,431,000	54,098,000	225,324,000	133,245,000
General and administrative	3,804,000	1,635,000	9,396,000	5,281,000
Depreciation	7,900,000	7,016,000	22,767,000	20,188,000
Cost and expenses total	97,135,000	62,749,000	257,487,000	158,714,000
Income (loss) from operations	898,000	(1,571,000)	(8,464,000)	(12,621,000)
Other income:
Interest income	2,000	20,000	33,000	78,000
Other income	21,000	126,000	603,000	223,000
Income (loss) before income tax	921,000	(1,425,000)	(7,828,000)	(12,320,000)
Income tax (expense) benefit	(587,000)	406,000	1,638,000	4,379,000
Net income (loss)	$ 334,000	$ (1,019,000)	$ (6,190,000)	$ (7,941,000)
Basic income (loss) per common share	$ 0.04	$ (0.13)	$ (0.79)	$ (1.02)
Diluted income (loss) per common share	$ 0.04	$ (0.13)	$ (0.79)	$ (1.02)
Weighted average equivalent common shares outstanding	7,812,519	7,779,256	7,801,396	7,776,740
Weighted average equivalent common shares outstanding -assuming dilution	7,925,181	7,779,256	7,801,396	7,776,740