Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013
Line of Credit Facility [Line Items]
Interest rate floor related to Susquehanna Bank agreement (in hundredths)	4.50%
Performance Bond Abstract
Number of Standby Letters of Credit	16
Number of Surety Bonds	5
Letter of Credit and Surety Bonds	$ 6.8
Number of Performance and Bid Bonds issued in relation to contracts	16
Number of stand by letters of credit deposited in escrow accounts	7
Amount of escrow accounts, which are restricted until the associated standby letters of credit have expired	2.0
First Line of Credit [Member]
Line of Credit Facility [Line Items]
Principal amount of the Susquehanna line of credit	7.5
Line of credit facility term in years	P2Y
Expiration date of credit agreements with Susquehanna Bank	June 30, 2014
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	$29.9 million
Quick ratio - Covenant Description	Must Exceed 2.00 : 1.00
Quick ratio- Covenant Compliance	2.35 : 1.00
Tangible capital base ratio - Covenant Description	Not to Exceed .75 : 1.00
Tangible capital base ratio - Covenant Compliance	.68 : 1.00