Reinsurance (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Reinsurance Effect on Premiums Written and Earned
Direct premiums Written	$ 1,465	$ 436	$ 2,776	$ 629
Assumed premiums - nonaffiliate Written	3,320	2,572	6,653	3,481
Ceded premiums - nonaffiliate Written	(929)	(398)	(1,692)	(513)
Net premiums Written	3,856	2,610	7,737	3,597
Direct premiums Earned	1,011	324	1,818	411
Assumed premiums - nonaffiliate Earned	2,957	2,434	5,729	3,214
Ceded premiums - nonaffiliate Earned	(929)	(398)	(1,692)	(513)
Net premiums Earned	$ 3,039	$ 2,360	$ 5,855	$ 3,112