Stockholder's Equity (Details 4) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
The Plan
Retirement Plans
Employer contribution as a percentage of participant's compensation	50.00%
Maximum employer contribution as a percentage of participant's compensation	4.00%
Discretionary annual contributions made to the Plan	$ 0	$ 0	$ 0
RDUKL Plan
Retirement Plans
Amount contributed by employer	$ 41,000	$ 34,000	$ 39,000
RDUKL Plan | Minimum
Retirement Plans
Employer contribution as a percentage of participant's compensation	3.00%
RDUKL Plan | Maximum
Retirement Plans
Employer contribution as a percentage of participant's compensation	8.00%