Interest Rates and Company Borrowings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest and debt expense:
Weighted average interest rate	1.52%	1.69%	1.50%	1.71%
Interest rate	1.52%	0.00%	1.52%	0.00%
Maximum amount outstanding	$ 25,000	$ 48,920	$ 25,000	$ 48,920
Average amount outstanding	25,000	26,374	24,590	25,154
Facility fees	$ 64	$ 106	$ 156	$ 284