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Consolidated Balance Sheets (Parenthetical)
Sep. 30, 2012
Mar. 31, 2012
Sep. 30, 2011
Common Stock [Member]
      
Common stock, shares authorized 100,000,000 100,000,000 100,000,000
Common stock, shares issued 23,408,445 23,257,175 23,230,486
Common stock, shares outstanding 23,408,445 23,257,175 23,230,486
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