CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $)	Sep. 30, 2012	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 4,611,542	$ 4,653,226
Short-term investments	10,563,762	7,200,901
Accounts receivable, net	2,577,134	2,704,434
Inventories	869,554	698,742
Other	465,568	363,639
Total current assets	19,087,560	15,620,942
Property, plant, and equipment, net	1,087,182	1,171,979
Intangible assets, net	519,030	945,880
Long-term investments	240,000	4,429,140
Deferred tax assets	117,456	122,872
Total assets	21,051,228	22,290,813
Current liabilities:
Accounts payable	614,919	593,585
Current portion - deferred rent	35,000	35,000
Income tax payable	6,480	17,892
Accrued liabilities:
Compensation	1,501,995	1,576,147
Other	407,074	316,995
Total current liabilities	2,565,468	2,539,619
Deferred rent - less current portion	23,669	42,043
Accrued pension liability	424,481	474,396
Total liabilities	3,013,618	3,056,058
Commitments and Contingencies
Shareholders' equity:
Common stock $.01 par value; 40,000,000 shares authorized, 20,989,982 and 20,808,532 shares issued and outstanding at September 30, 2012 and March 31, 2012, respectively	209,900	208,085
Additional paid-in capital	55,409,538	54,906,670
Accumulated deficit	(37,174,716)	(35,515,835)
Accumulated other comprehensive net loss	(407,112)	(364,165)
Total shareholders' equity	18,037,610	19,234,755
Total liabilities and shareholders' equity	$ 21,051,228	$ 22,290,813