CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 30, 2011	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 10,500,112	$ 14,203,544
Marketable securities	39,320,124	35,421,520
Accounts receivable, less reserve for doubtful accounts of $10,000	4,020,475	1,259,607
Royalties receivable	2,789,458	2,512,602
Inventories	2,460,085	1,953,976
Prepaid expenses and other current assets	925,341	492,767
Total current assets	60,015,595	55,844,016
Property, plant and equipment, at cost:
Leasehold improvements	3,887,476	3,879,130
Equipment	4,757,628	4,426,628
Furniture and fixtures	643,829	644,541
Total property, plant and equipment, at cost	9,288,933	8,950,299
Less: Accumulated depreciation	(7,516,817)	(6,793,984)
Property, plant and equipment, net	1,772,116	2,156,315
Long-term marketable securities	8,453,736	11,878,201
Intangible assets, net	1,132,083	1,221,458
Goodwill	994,000	994,000
Restricted cash	200,000	200,000
Total assets	72,567,530	72,293,990
Current liabilities:
Accounts payable	580,447	930,601
Accrued liabilities	3,572,517	3,692,523
Total current liabilities	4,152,964	4,623,124
Long-term liabilities	580,326	584,162
Total liabilities	4,733,290	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, 30,714,757 shares at September 30, 2011 and 30,812,257 shares at March 31, 2011 issued and outstanding	307,148	308,123
Additional paid-in capital	184,669,317	184,743,195
Accumulated other comprehensive income	2,687
Accumulated deficit	(117,144,912)	(117,964,614)
Total stockholders' equity	67,834,240	67,086,704
Total liabilities and stockholders' equity	$ 72,567,530	$ 72,293,990