CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net loss	$ (1,019,355)	$ (1,331,307)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	288,548	274,102
Loss on disposal of equipment	599	5,996
Amortization of premium on marketable securities	8,091	11,656
Share-based consulting expense	1,623	1,449
Share-based compensation expense	162,435	130,352
Deferred income taxes	(1,117)	(1,462)
Deferred rent	(9,111)	(8,807)
Changes in operating assets and liabilities:
Accounts receivable, net	24,329	68,193
Inventories	(122,672)	(35,090)
Other current assets	(107,267)	(96,533)
Accounts payable	137,599	(94,797)
Accrued liabilities	(106,432)	(329,364)
Accrued pension liability, net	41,029	42,082
Net cash used in operating activities	(701,701)	(1,363,530)
Cash flows from investing activities:
Proceeds from maturity of held-to-maturity marketable securities	3,320,000	1,500,000
Proceeds from maturity of available-for-sale marketable securities	0	2,750,059
Purchases of held-to-maturity marketable securities	0	(3,840,016)
Purchases of available-for-sale marketable securities	(3,218,286)	0
Purchases of property, plant and equipment	(73,902)	(70,865)
Purchase of intangible assets	(4,440)	(10,405)
Net cash provided by (used in) investing activities	23,372	328,773
Cash flows from financing activities:
Net proceeds from exercise of options	0	126,550
Net cash provided by financing activities	0	126,550
Effect of exchange rate changes on cash and cash equivalents	(18,642)	5,575
Net (decrease) increase in cash and cash equivalents	(696,971)	(902,632)
Cash and cash equivalents at beginning of period	4,653,226	6,063,573
Cash and cash equivalents at end of period	3,956,255	5,160,941
Cash paid during the period for income taxes	$ 18,592	$ 8,968