Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2011	Mar. 31, 2011
Shareholders' equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	3,677	3,677
Preferred stock, shares outstanding	3,677	3,677
Preferred stock, liquidation preference	$ 3,677,000	$ 3,677,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	52,965,797	52,965,797
Common stock, shares outstanding	27,129,832	27,129,832
Treasury stock, shares	25,835,965	25,835,965