Lines of Credit (Details Narrative) (USD $)	0 Months Ended	1 Months Ended		12 Months Ended
	Sep. 03, 2009	Feb. 28, 2012	Feb. 28, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Apr. 30, 2011	Mar. 31, 2010	Feb. 28, 2010
Lines Of Credit Details Narrative
Revolving line of credit, maximum borrowing capacity							$ 7,000,000	$ 7,000,000	$ 8,000,000
Revolving line of credit, asset restrictions				Under this agreement, the aggregate borrowings at any one time under the revolving line may not exceed the sum of 100% of all eligible accounts receivable plus 100% of all gas inventory plus 50% of miscellaneous eligible inventories (material and supplies on the balance sheet) plus 100% of the value of the Rabbi Trust investment account up to the $7.0 million limit.
Revolving line of credit, amount outstanding				2,196,995	4,178,784	5,140,649
Revolving line of credit, maximum amount outstanding during period				$ 6,607,788	$ 6,246,562	$ 7,437,118
Revolving line of credit, interest rate formula description	On September 3, 2009, due to market conditions, the interest rate formula was changed to the greater of 4% or 225 basis points above 30 days LIBOR.	In February 2012 the interest rate was lowered to the greater of 3.25% or 2.5% above the 30-day LIBOR.	In February 2011, we negotiated the new rate formula as a fluctuating rate equal to the greater of 3.5% or the 30-day LIBOR plus 2.25%. The line of credit is payable on demand with an interest rate of 3.5% on September 30, 2011.
Weighted average interest rate on outstanding borrowings				3.35%	3.78%	4.00%