CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical) (USD $)	3 Months Ended	12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Proceeds from exercise of stock options (in shares)	67,450	324,140
Proceeds from exercise of stock options, tax benefits	$ 654,492	$ 2,072,030
Common stock repurchases (in shares)	907,777	2,181,045
Issuance of restricted common stock under stock option plan (in shares)	10,000	60,416