Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Line of Credit Facility [Line Items]
Issuances of stand-by letters of credit and advances as of period end	$ 3.7
Performance Bond Abstract
Number of Standby Letters of Credit	16
Number of Surety Bonds	5
Letter of Credit and Surety Bonds	6.6
Number of Performance and Bid Bonds issued in relation to contracts	16
Number of stand by letters of credit deposited in certificates of deposit	6
Amount of certificate of deposit, which are restricted until eleven standby letters of credit have expired	1.8
First Line of Credit [Member]
Line of Credit Facility [Line Items]
Principal amount of the Susquehanna line of credit	7.5
Interest rate floor related to Susquehanna Bank agreement (in hundredths)	4.50%
Line of credit facility term in years	P2Y
Expiration date of credit agreements with Susquehanna Bank	November 1, 2013
Minimum Cash Balance Requirement	$ 3.0
Number of consecutive quarters entity must attain positive net income	2
Minimum tangible capital base - Covenant Description	Must Exceed 26.0 million
Minimum tangible capital base - Covenant Compliance	31.9 million
Quick ratio - Covenant Description	Must Exceed 2.00 : 1.00
Quick ratio- Covenant Compliance	2.59 : 1.00
Tangible capital base ratio - Covenant Description	Not to Exceed .75 : 1.00
Tangible capital base ratio - Covenant Compliance	.58 : 1.00