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Interest Rate Swap Agreements - Summary of interest rate swap agreements (Details 1) (Interest Rate Swap, USD $)	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Fixed rate of interest 1.00%
Derivatives, Fair Value [Line Items]
Date Entered	Jun. 01, 2012	Jun. 01, 2012
Effective Date	Jun. 13, 2012	Jun. 13, 2012
Notional Amount	$ 25,000,000	$ 25,000,000
Fixed Rate Of Interest	1.00%	1.00%
Maturity Date	Jun. 13, 2017	Jun. 13, 2017
Fixed rate of interest 0.87%
Derivatives, Fair Value [Line Items]
Date Entered	Jul. 30, 2012	Jul. 30, 2012
Effective Date	Aug. 13, 2012	Aug. 13, 2012
Notional Amount	$ 25,000,000	$ 25,000,000
Fixed Rate Of Interest	0.87%	0.87%
Maturity Date	Aug. 14, 2017	Aug. 14, 2017

X

- Definition

Represents effective date of derivative contract, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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X

- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

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X

- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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X

- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

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X

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

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