CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $)	Dec. 31, 2012	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 4,809,541	$ 4,653,226
Short-term investments	9,613,945	7,200,901
Accounts receivable, net	2,463,572	2,704,434
Inventories	835,153	698,742
Other	433,790	363,639
Total current assets	18,156,001	15,620,942
Property, plant, and equipment, net	1,075,259	1,171,979
Intangible assets, net	303,349	945,880
Long-term investments	1,199,672	4,429,140
Deferred tax assets	117,122	122,872
Total assets	20,851,403	22,290,813
Current liabilities:
Accounts payable	507,183	593,585
Current portion - deferred rent	35,000	35,000
Income tax payable	7,098	17,892
Accrued liabilities:
Compensation	1,822,412	1,576,147
Other	346,851	316,995
Total current liabilities	2,718,544	2,539,619
Deferred rent - less current portion	14,405	42,043
Accrued pension liability	475,232	474,396
Total liabilities	3,208,181	3,056,058
Commitments and Contingencies
Shareholders' equity:
Common stock $.01 par value; 40,000,000 shares authorized, 21,015,582 and 20,808,532 shares issued and outstanding at December 31, 2012 and March 31, 2012, respectively	210,156	208,085
Additional paid-in capital	55,665,175	54,906,670
Accumulated deficit	(37,852,040)	(35,515,835)
Accumulated other comprehensive net loss	(380,069)	(364,165)
Total shareholders' equity	17,643,222	19,234,755
Total liabilities and shareholders' equity	$ 20,851,403	$ 22,290,813