CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND COMPREHENSIVE INCOME (LOSS) (Unaudited) (Parenthetical) (USD $)	9 Months Ended	12 Months Ended
	Dec. 31, 2011	Mar. 31, 2011
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Proceeds from exercise of stock options (in shares)	268,000	447,250
Proceeds from exercise of stock options, tax benfits	$ 914,886	$ 1,923,628
Common stock repurchases (in shares)	1,167,245	1,298,057
Issuance of restricted common stock under stock option plan (in shares)	60,416	54,951