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Stock-Based Compensation and Employee Stock Purchase Plan (Narrative) (Details) (USD $)	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Stock-based employee compensation expense	$ 556,000	$ 266,000
Stock-Based Awards
Unamortized stock-based compensation expense related to unvested stock awards	3,900,000
Weighted average period of recognition for unrecognized compensation costs (in years)	3.14
Stock-based employee compensation expense	382,000	186,000
Employee Stock Purchase Plan
Unamortized stock-based compensation expense related to unvested stock awards	164,000
Weighted average period of recognition for unrecognized compensation costs (in years)	0.5
Stock-based employee compensation expense	$ 174,000	$ 80,000
Percentage of market value price of common stock under Employee Stock Purchase Plan	85.00%
Maximum contribution percentage amount of employee's base compensation	10.00%

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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