CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2013	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 3,533,864	$ 4,653,226
Short-term investments	7,936,605	7,200,901
Accounts receivable, net	2,553,447	2,704,434
Inventories	718,933	698,742
Other	566,536	363,639
Total current assets	15,309,385	15,620,942
Property, plant, and equipment, net	1,033,085	1,171,979
Intangible assets, net	100,502	945,880
Long-term investments	3,451,711	4,429,140
Deferred tax assets	146,052	122,872
Total assets	20,040,735	22,290,813
Current liabilities:
Accounts payable	618,916	593,585
Current portion - deferred rent	35,000	35,000
Income tax payable	7,729	17,892
Accrued liabilities:
Compensation	1,550,846	1,576,147
Other	476,287	316,995
Total current liabilities	2,688,778	2,539,619
Deferred rent - less current portion	5,141	42,043
Accrued pension liability	660,580	474,396
Total liabilities	3,354,499	3,056,058
Commitments and contingencies
Shareholders' equity:
Common stock $.01 par value; 40,000,000 shares authorized, 21,005,582 and 20,808,532 shares issued and outstanding at March 31, 2012 and 2011, respectively.	210,056	208,085
Additional paid-in capital	55,866,338	54,906,670
Accumulated deficit	(38,820,981)	(35,515,835)
Accumulated other comprehensive loss	(569,177)	(364,165)
Total shareholders' equity	16,686,236	19,234,755
Total liabilities and shareholders' equity	$ 20,040,735	$ 22,290,813