CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $)	Jun. 30, 2013	Mar. 31, 2013
Current assets:
Cash and cash equivalents	$ 4,494,373	$ 3,533,864
Short-term investments	9,165,462	7,936,605
Accounts receivable, net	2,501,211	2,553,447
Inventories	680,212	718,933
Other	544,017	566,536
Total current assets	17,385,275	15,309,385
Property, plant, and equipment, net	1,151,218	1,033,085
Intangible assets, net	93,855	100,502
Long-term investments	399,672	3,451,711
Deferred tax assets	145,930	146,052
Total assets	19,175,950	20,040,735
Current liabilities:
Accounts payable	883,827	618,916
Current portion - deferred rent	30,878	35,000
Income tax payable	162	7,729
Accrued liabilities:
Compensation	1,572,028	1,550,846
Other	868,938	476,287
Total current liabilities	3,355,833	2,688,778
Deferred rent	0	5,141
Accrued pension liability	709,993	660,580
Total liabilities	4,065,826	3,354,499
Commitments and Contingencies
Shareholders' equity:
Common stock $.01 par value; 40,000,000 shares authorized, 20,934,245 and 21,005,582 shares issued and outstanding at June 30, 2013 and March 31, 2013, respectively	209,342	210,056
Additional paid-in capital	55,883,096	55,866,338
Accumulated deficit	(40,430,273)	(38,820,981)
Accumulated other comprehensive net loss	(552,041)	(569,177)
Total shareholders' equity	15,110,124	16,686,236
Total liabilities and shareholders' equity	$ 19,175,950	$ 20,040,735