Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2018	Mar. 31, 2018
Consolidated Balance Sheets [Abstract]
Class C convertible preferred stock par value	$ 1.50	$ 1.50
Class C convertible preferred stock, conversion value	$ 0.064	$ 0.064
Class C convertible preferred stock shares authorized	150,000	150,000
Class C convertible preferred stock shares issued	21,802	21,802
Class C convertible preferred stock shares outstanding	21,802	21,802
Common stock par value	$ 0.01	$ 0.01
Common stock shares authorized	65,000,000	65,000,000
Common stock shares issued	39,204,404	39,166,392
Treasury stock shares	6,337,747	6,330,008