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Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Mar. 31, 2013 Y	Mar. 31, 2012	Mar. 31, 2011
Employee Benefit Plans
Eligible age of employees to participate in the defined contribution plan	21
Service time of employees to participate in the defined contribution plan	1 hour
Percentage of employees contribution for which the company contributes a matching contribution	50.00%
Maximum percentage of employee's salary on which the company contributes a 50% matching contribution	6.00%
Contribution by employer	$ 214,000	$ 193,000	$ 184,000
Bozeman
Employee Benefit Plans
Eligible age of employees to participate in the defined contribution plan	21
Requisite service period	1 year
Percentage of employees contribution for which the company contributes a matching contribution	100.00%
Maximum percentage of employee's salary on which the company contributes a 50% matching contribution	4.00%

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- Definition

Represents the eligible age of employees to participate in the defined contribution plan.

+ References

No definition available.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

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- Definition

Estimated period over which an employee is required to provide service to be eligible to participate in the defined contribution plan.

+ References

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- Definition

Represents the service time of employees to participate in the defined contribution plan.

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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