Stockholders' Equity Stock Purchase Right Activity (Details) - $ / shares	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Stockholders Equity Stock Purchase Right Activity Details
Balance at beginning of year	223,835	489,627	958,575
Granted	0	31,432	22,380
Vested	(115,789)	(223,360)	(392,844)
Forfeited	(25,875)	(73,864)	(98,484)
Balance at end of year	82,171	223,835	489,627	958,575
Weighted-average grant date fair value, beginning balance	$ 5.92	$ 4.83	$ 4.11
Weighted-average grant date fair value of restricted stock rights granted	0	7.88	9.69
Weighted-average grant date fair value, released during period	5.32	3.98	3.25
Weighted-average grant date fair value, forfeited during period	7.40	5.39	5.18
Weighted-average grant date fair value, ending balance	$ 6.30	$ 5.92	$ 4.83	$ 4.11
Weighted-average remaining contractual term, in years, ending balance	1 year 241 days	1 year 317 days	1 year 335 days	2 years 187 days