Stockholders' Equity Stock Purchase Right Activity (Details) - $ / shares	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Stockholders Equity Stock Purchase Right Activity Details
Balance at beginning of year	82,171	223,835	489,627
Granted	0	0	31,432
Vested	(69,426)	(115,789)	(223,360)
Forfeited	(1,375)	(25,875)	(73,864)
Balance at end of year	11,370	82,171	223,835	489,627
Weighted-average grant date fair value, beginning balance	$ 6.30	$ 5.92	$ 4.83
Weighted-average grant date fair value of restricted stock rights granted	0	0	7.88
Weighted-average grant date fair value, released during period	6.00	5.32	3.98
Weighted-average grant date fair value, forfeited during period	6.72	7.40	5.39
Weighted-average grant date fair value, ending balance	$ 8.10	$ 6.30	$ 5.92	$ 4.83
Weighted-average remaining contractual term, in years, ending balance	1 year 32 days	274 days	1 year 180 days	1 year 335 days