Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2011	Mar. 31, 2011
Consolidated Balance Sheets
Patent costs, accumulated amortization	$ 790,574	$ 781,608
Trademark costs, accumulated amortization	$ 56,378	$ 55,256
Common stock, par value per share	$ 0.01
Common stock, shares authorized	50,000,000
Common stock, shares issued and outstanding	36,224,267	36,213,293