CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $)	Sep. 30, 2011	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 9,538,350	$ 6,063,573
Short-term investments	4,623,946	8,020,577
Accounts receivable, net	2,255,593	2,085,262
Inventories	738,534	677,960
Other	489,730	348,100
Total current assets	17,646,153	17,195,472
Property, plant, and equipment, net	1,160,008	1,210,542
Intangible assets, net	1,365,963	1,725,136
Long-term investments	3,160,300	5,508,701
Deferred tax assets	86,839	87,031
Total assets	23,419,263	25,726,882
Current liabilities:
Accounts payable	626,650	658,107
Current portion - deferred rent	35,000	35,000
Income tax payable	8,193	6,901
Accrued liabilities:
Compensation	1,479,377	1,597,657
Other	339,299	247,451
Total current liabilities	2,488,519	2,545,116
Deferred rent - less current portion	59,658	77,272
Accrued pension liability	396,379	475,845
Total liabilities	2,944,556	3,098,233
Commitments and Contingencies
Common stock $.01 par value; 40,000,000 shares authorized, 20,806,032 and 20,664,332 shares issued and outstanding at September 30, 2011 and March 31, 2011, respectively	208,060	206,643
Additional paid-in capital	54,511,542	54,014,368
Accumulated deficit	(33,875,258)	(31,265,464)
Accumulated other comprehensive loss	(369,637)	(326,898)
Total shareholders' equity	20,474,707	22,628,649
Total liabilities and shareholders' equity	$ 23,419,263	$ 25,726,882