Joint Venture (Details) (USD $)	6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Net sales	$ 10,571,417	$ 11,418,433
Gross profit	2,296,928	2,726,225
Net income	196,721	792,317
Total current assets	12,924,828	14,625,933
Total assets	34,012,303	32,071,234
Total current liabilities	$ 4,933,787	$ 4,281,413