Interest Rates and Company Borrowings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Interest and debt expense:
Weighted average interest rate during the period	1.57%	1.80%	1.67%	1.72%
Interest rate at the end of the period	1.61%	1.77%	1.61%	1.77%
Maximum amount outstanding during the quarter	$ 25,000	$ 38,920	$ 48,920	$ 38,920
Average amount outstanding during the period	24,185	37,779	24,830	24,685
Facility fees	$ 115	$ 109	$ 399	$ 416