Stockholders' Equity (Summary Of Stock Options Outstanding And Exercisable) (Details) (USD $)					12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2014 $0.55 - $1.26	Mar. 31, 2014 $1.27 - $1.79	Mar. 31, 2014 $1.80 - $5.87	Mar. 31, 2014 $5.88 - $9.74	Mar. 31, 2014 $9.75 - $11.26	Mar. 31, 2014 $0.55 - $11.26
Range of Exercise Prices, Minimum					$ 0.55	$ 1.27	$ 1.80	$ 5.88	$ 9.75	$ 0.55
Range of Exercise Prices, Maximum					$ 1.26	$ 1.79	$ 5.87	$ 9.74	$ 11.26	$ 11.26
Options Outstanding, Number of Shares	6,002,382	5,991,544	6,034,335	6,969,196	1,725,000	1,257,178	1,564,614	1,305,590	150,000	6,002,382
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 4.14	$ 2.52	$ 1.90	$ 1.56	$ 1.04	$ 1.53	$ 4.58	$ 9.40	$ 11.11
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)					3.8	1.9	6.0	8.9	9.8
Options Outstanding, Aggregate Intrinsic Value					$ 16,855,760	$ 11,663,456	$ 9,740,969	$ 1,847,196	$ 0	$ 40,107,381
Options Exercisable, Number of Shares					1,725,000	1,257,178	774,413	69,271	0	3,825,862
Options Exercisable, Weighted-Average Exercise Price Per Share					$ 1.04	$ 1.53	$ 4.16	$ 8.79	$ 0
Options Exercisable, Aggregate Intrinsic Value					$ 16,855,760	$ 11,663,456	$ 5,150,429	$ 139,929	$ 0	$ 33,809,574