CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net loss	$ (5,353,090)	$ (3,305,146)	$ (4,250,371)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	353,238	1,152,929	1,118,243
Gain (loss) on disposal of equipment	(2,872)	7,617	8,447
Amortization of premium on marketable securities	8,341	47,559	35,277
Share-based consulting expense	0	1,623	5,448
Share-based compensation expense	1,436,270	810,016	679,471
Deferred income tax expense	6,498	(29,053)	(40,116)
Deferred rent	(37,053)	(36,902)	(35,228)
Changes in operating assets and liabilities:
Accounts receivable, net	(257,794)	108,495	(653,110)
Inventories	207,050	(25,370)	(29,719)
Other current assets	63,899	(205,778)	(17,510)
Accounts payable	281,104	30,925	(59,025)
Accrued compensation	436,765	(25,301)	(21,510)
Accrued liabilities, other	6,472	164,176	85,491
Accrued pension liability, net	(51,000)	79,598	45,843
Net cash used in operating activities	(2,902,172)	(1,224,612)	(3,128,369)
Cash flows from investing activities:
Proceeds from maturity of available-for-sale marketable investments	7,930,000	4,200,000	10,018,252
Proceeds from maturity of held-to-maturity marketable investments	0	6,920,000	3,740,000
Purchases of available-for-sale marketable investments	0	(8,425,034)	(3,046,270)
Purchases of held-to-maturity marketable investments	0	(2,500,000)	(8,840,000)
Purchases of property, plant and equipment	(248,105)	(189,929)	(267,944)
Proceeds from sale of property, plant and equipment	6,773	5,591	0
Payments for intangible assets	(49,940)	(17,455)	(77,738)
Net cash provided by (used in) investing activities	7,638,728	(6,827)	1,526,300
Cash flows from financing activities:
Proceeds from exercise of stock options	359,502	150,000	208,825
Net cash provided by financing activities	359,502	150,000	208,825
Effect of exchange rates on cash and cash equivalents	51,687	(37,923)	(17,103)
Net increase (decrease) in cash and cash equivalents	5,147,745	(1,119,362)	(1,410,347)
Cash and cash equivalents at beginning of year	3,533,864	4,653,226	6,063,573
Cash and cash equivalents at end of year	8,681,609	3,533,864	4,653,226
Supplemental disclosure of cash flow information:
Cash paid during the year for interest	0	707	57
Cash paid during the year for income tax	$ 71,899	$ 57,288	$ 39,005