Consolidated Balance Sheets (Parenthetical) - shares	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014
Common Stock [Member]
Common stock, shares authorized	100,000,000	100,000,000	100,000,000
Common stock, shares issued	22,680,233	22,593,266	23,183,259
Common stock, shares outstanding	22,680,233	22,593,266	23,183,259
Series A Junior Participating Preferred Stock [Member]
Preferred stock, shares authorized	500,000	500,000	500,000
Preferred stock, shares issued	0	0	0
Preferred stock, shares outstanding	0	0	0
Series B 6.75% Convertible Perpetual Preferred Stock [Member]
Preferred stock, shares authorized	220,000	220,000	220,000
Preferred stock, shares issued	218,490	218,490	219,999
Preferred stock, shares outstanding	218,490	218,490	219,999