CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net loss	$ (3,270,579)	$ (3,536,772)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	139,252	179,123
Loss (gain) loss on disposal of equipment	834	(5,000)
Amortization of premium on marketable securities	311	6,070
Share-based compensation expense	660,891	920,729
Deferred income tax expense	1,973	4,979
Deferred rent	23,150	(18,526)
Changes in operating assets and liabilities:
Accounts receivable, net	155,498	197,216
Inventories	(10,822)	97,787
Other current assets	(18,093)	127,104
Accounts payable	(230,103)	51,232
Accrued compensation	113,132	(51,129)
Accrued liabilities	(5,669)	(78,619)
Accrued pension liability	(35,524)	(137,089)
Net cash used in operating activities	(2,475,749)	(2,242,895)
Cash flows from investing activities:
Proceeds from maturity of available-for-sale investments	3,450,000	2,000,000
Proceeds from maturity of held-to-maturity investments	0	3,940,000
Purchases of property, plant and equipment	(128,041)	(208,768)
Proceeds from sale of property, plant and equipment	1,552	6,773
Payments for intangible assets	0	(41,300)
Net cash provided by investing activities	3,323,511	5,696,705
Cash flows from financing activities:
Proceeds from exercise of stock options	67,850	69,360
Net cash provided by financing activities	67,850	69,360
Effect of exchange rate changes on cash and cash equivalents	(57,053)	34,724
Net increase in cash and cash equivalents	858,559	3,557,894
Cash and cash equivalents at beginning of period	8,681,609	3,533,864
Cash and cash equivalents at end of period	9,540,168	7,091,758
Cash paid during the period for income taxes	$ 42,715	$ 25,334