4. Contract Costs and Estimated Profits in Excess of Billings (Details) (USD $)	Jun. 30, 2013	Jun. 30, 2012
Accounting Policies [Abstract]
Costs incurred on contracts in progress	$ 3,463,691	$ 3,074,540
Estimated contract profit	559,052	643,526
Total	4,022,743	3,718,066
Less: billings to date	3,323,400	2,790,988
Contract costs and related estimated profits in excess of billings	$ 699,343	$ 927,078