Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $)	Jun. 30, 2013	Mar. 31, 2013
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	500,000	500,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars shares)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	15,000,000	15,000,000
Common stock, issued (in shares)	13,578,313	13,362,398
Common stock, outstanding (in shares)	8,139,298	7,987,900
Treasury stock (in shares)	5,439,015	5,374,498