Commitments and Contingencies (Details) (USD $)	3 Months Ended
Jun. 30, 2011
Notes (Details)
Amount paid to settle environmental liability	$ 487,000

Cash outflows made during the period for environmental remediation activities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

Name:	us-gaap_PaymentsForEnvironmentalLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration