Share-Based Compensation (Details 1) (USD $)	3 Months Ended
	Jun. 30, 2012
Summary of stock option activity
Number of Shares, Outstanding options at beginning of period	1,031,713
Number of Shares, Granted	3,750
Number of Shares, Exercised	(187)
Number of Shares, Cancelled	(20,400)
Number of Shares, Outstanding options at end of period	1,014,876
Number of Shares, Outstanding exercisable at end of period	636,850
Weighted Average Exercise Price, Outstanding options at beginning of period	$ 12.77
Weighted Average Exercise Price, Granted	$ 12.90
Weighted Average Exercise Price, Exercised	$ 7.75
Weighted Average Exercise Price, Cancelled	$ 13.61
Weighted Average Exercise Price, Outstanding options at end of period	$ 12.75
Weighted Average Exercise Price, Outstanding exercisable at end of period	$ 12.06
Weighted Average Remaining Contract Life, Outstanding options at end of period	3 years 8 months 12 days
Weighted Average Remaining Contract Life, Outstanding exercisable at end of period	2 years 7 months 6 days