Stockholders' Equity Stock Purchase Right Activity (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Stockholders Equity Stock Purchase Right Activity Details
Balance at beginning of year	489,627	958,575	966,400
Granted	31,432	22,380	443,436
Vested	(223,360)	(392,844)	(367,017)
Forfeited	(73,864)	(98,484)	(84,244)
Balance at end of year	223,835	489,627	958,575	966,400
Weighted-average grant date fair market value, beginning balance	$ 4.83	$ 4.11	$ 2.50
Weighted-average grant date fair market value of restricted stock rights granted	$ 7.88	$ 9.69	$ 5.75
Weighted-average grant date fair market value, released during period	$ 3.98	$ 3.25	$ 2.14
Weighted-average grant date fair market value, forfeited during period	$ 5.39	$ 5.18	$ 2.89
Weighted-average grant date fair market value, ending balance	$ 5.92	$ 4.83	$ 4.11	$ 2.50
Weighted-average remaining contractual term, in years, ending balance	1 year 183 days	1 year 339 days	2 years 190 days	2 years 223 days