Consolidated Balance Sheets (Parenthetical)	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012
Common Stock [Member]
Common stock, shares authorized	100,000,000	100,000,000	100,000,000
Common stock, shares issued	23,192,039	23,343,973	23,356,713
Common stock, shares outstanding	23,192,039	23,343,973	23,356,713
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	219,999	219,999	219,999
Preferred stock, shares outstanding	219,999	219,999	219,999