Costs and Estimated Earnings in Excess of Billings (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011
Costs and estimated earnings in excess of billings on uncompleted contracts
Costs incurred on uncompleted contracts	$ 4,986,000	$ 7,039,000
Estimated earnings	1,518,000	2,059,000
Costs and estimated earnings on uncompleted contracts	6,504,000	9,098,000
Billings to date	3,056,000	4,648,000
Costs and estimated earnings in excess of billings	$ 3,448,000	$ 4,450,000