CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net loss	$ (2,336,205)	$ (3,677,332)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	864,227	832,309
Loss on disposal of equipment	3,035	6,475
Amortization of premium on marketable securities	39,551	27,210
Share-based consulting expense	1,623	4,125
Share-based compensation expense	608,953	498,906
Deferred income tax expense (benefit)	5,473	(4,698)
Deferred rent credit	(27,638)	(26,421)
Changes in operating assets and liabilities:
Accounts receivable, net	228,768	(374,068)
Inventories	(138,862)	(146,058)
Other current assets	(70,401)	(106,156)
Accounts payable	(82,514)	(82,491)
Accrued liabilities	267,083	356,589
Accrued pension liability, net	5,074	(25,428)
Net cash used in operating activities	(631,833)	(2,717,038)
Cash flows from investing activities:
Proceeds from maturity of held-to-maturity investments	5,000,000	3,500,000
Proceeds from maturity of available-for-sale investments	3,200,000	9,518,252
Purchases of held-to-maturity investments	(2,500,000)	(7,640,000)
Purchases of available-for-sale investments	(4,921,036)	(3,046,270)
Purchases of property, plant and equipment	(137,101)	(222,826)
Proceeds from sale of property, plant and equipment	7,038	0
Purchase of intangible assets	(4,440)	(77,738)
Net cash provided by investing activities	644,461	2,031,418
Cash flows from financing activities:
Net proceeds from exercise of options	150,000	208,825
Net cash provided by financing activities	150,000	208,825
Effect of exchange rate changes on cash and cash equivalents	(6,313)	(26,208)
Net increase (decrease) in cash and cash equivalents	156,315	(503,003)
Cash and cash equivalents at beginning of period	4,653,226	6,063,573
Cash and cash equivalents at end of period	4,809,541	5,560,570
Cash paid during the period for interest	12	57
Cash paid during the period for income taxes	$ 42,319	$ 31,307