CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $)	Jun. 30, 2011	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 5,160,941	$ 6,063,573
Short-term investments	8,889,719	8,020,577
Accounts receivable, net	2,032,268	2,085,262
Inventories	714,089	677,960
Other	445,662	348,100
Total current assets	17,242,679	17,195,472
Property, plant, and equipment, net	1,228,182	1,210,542
Intangible assets, net	1,523,226	1,725,136
Long-term investments	4,229,328	5,508,701
Deferred tax assets	90,296	87,031
Total assets	24,313,711	25,726,882
Current liabilities:
Accounts payable	564,957	658,107
Current portion - deferred rent	35,000	35,000
Income tax payable	13,473	6,901
Accrued liabilities:
Compensation	1,169,252	1,597,657
Other	344,863	247,451
Total current liabilities	2,127,545	2,545,116
Deferred rent - less current portion	68,465	77,272
Accrued pension liability	525,907	475,845
Total liabilities	2,721,917	3,098,233
Shareholders' equity:
Common stock $.01 par value; 40,000,000 shares authorized, 20,752,282 and 20,664,332 shares issued and outstanding at June 30, 2011 and March 31, 2011, respectively	207,523	206,643
Additional paid-in capital	54,271,839	54,014,368
Accumulated deficit	(32,596,771)	(31,265,464)
Accumulated other comprehensive loss	(290,797)	(326,898)
Total shareholders' equity	21,591,794	22,628,649
Total liabilities and shareholders' equity	$ 24,313,711	$ 25,726,882