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Accounts Receivable (Details Textual) (USD $)	12 Months Ended
Accounts Receivable (Details Textual) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Accounts Receivable (Textual) [Abstract]
Amount billed but not received under retainage provisions in contracts	$ 351,000	$ 504,000
Provision for doubtful accounts	176,000	402,000
Accounts charged to the allowance	$ 165,000	$ 269,000
Retainage receivables on contracts period	P1Y

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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