CONSOLIDATED BALANCE SHEETS (USD $)	Jun. 30, 2011	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 7,466,587	$ 14,203,544
Marketable securities	36,107,680	35,421,520
Accounts receivable, less reserve for doubtful accounts of $10,000	2,521,817	1,259,607
Royalties receivable	2,772,457	2,512,602
Inventories	2,692,789	1,953,976
Prepaid expenses and other current assets	660,399	492,767
Total current assets	52,221,729	55,844,016
Property, plant and equipment, at cost:
Leasehold improvements	3,887,476	3,879,130
Equipment	4,594,344	4,426,628
Furniture and fixtures	636,481	644,541
Total property, plant and equipment, at cost	9,118,301	8,950,299
Less: Accumulated depreciation	(7,155,674)	(6,793,984)
Property, plant and equipment, net	1,962,627	2,156,315
Long-term marketable securities	15,050,402	11,878,201
Intangible assets, net	1,176,771	1,221,458
Goodwill	994,000	994,000
Restricted cash	200,000	200,000
Total assets	71,605,529	72,293,990
Current liabilities:
Accounts payable	922,525	930,601
Accrued liabilities	2,793,352	3,692,523
Total current liabilities	3,715,877	4,623,124
Long-term liabilities	576,527	584,162
Total liabilities	4,292,404	5,207,286
Commitments and contingencies
Stockholders' equity:
Preferred stock, $.01 par value, 5,000,000 shares authorized, no shares issued or outstanding
Common stock, $.01 par value, 40,000,000 shares authorized, 30,812,257 shares at June 30, 2011 and March 31, 2011 issued and outstanding	308,123	308,123
Additional paid-in capital	185,025,213	184,743,195
Accumulated deficit	(118,020,211)	(117,964,614)
Total stockholders' equity	67,313,125	67,086,704
Total liabilities and stockholders' equity	$ 71,605,529	$ 72,293,990