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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
Dec. 31, 2012
Mar. 31, 2012
Shareholders' equity:    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, authorized (in shares) 5,000,000 5,000,000
Preferred stock, issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, authorized (in shares) 20,000,000 20,000,000
Common stock, issued (in shares) 14,526,717 12,533,821
Common stock, outstanding (in shares) 14,493,197 12,519,421
Treasury stock, shares (in shares) 33,520 14,400
Series A Junior Participating Preferred Stock [Member]
    
Shareholders' equity:    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, authorized (in shares) 20,000 20,000
Preferred stock, issued (in shares) 0 0