Stock-Based Compensation (Summary Of Stock Options And Warrants) (Details) (USD $)	12 Months Ended
	Mar. 31, 2014 Option Shares Reserved [Member]	Mar. 31, 2013 Option Shares Reserved [Member]	Mar. 31, 2012 Option Shares Reserved [Member]	Mar. 31, 2014 Options [Member]	Mar. 31, 2013 Options [Member]	Mar. 31, 2012 Options [Member]	Mar. 31, 2014 Warrants [Member]	Mar. 31, 2013 Warrants [Member]	Mar. 31, 2011 Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Beginning	158,230	162,230	166,230	49,000	109,000	175,000	4,000	10,000	10,000
Granted	(4,000)	(4,000)	(4,000)	4,000	4,000	4,000
Exercised				(14,000)	(64,000)	(70,000)
Terminated	1,000			(1,000)			(2,000)	(6,000)
Options Outstanding, Ending		158,230	162,230		49,000	109,000		4,000	10,000
Weighted Average Option Exercise Price, Beginning				$ 30.27	$ 25.85	$ 21.54	$ 29.69	$ 16.28	$ 16.28
Granted				$ 49.86	$ 54.11	$ 58.25
Exercised				$ 29.77	$ 24.23	$ 16.93
Terminated				$ 58.27			$ 21.99	$ 7.35
Weighted Average Option Exercise Price, Ending					$ 30.27	$ 25.85		$ 29.69	$ 16.28