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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 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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