Note 9. Segment Information (Details) - Key Financial Highlights By Reportable Segments (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 3,652	$ 3,396
Gross profit	1,080	913
Operating (loss) income	(2,389)	(2,304)
Interest expense, net	41	194
Depreciation and amortization	188	204
Stock-based compensation expense	555	443
Total assets	11,070	11,188	11,377
Expenditures for fixed assets		36
Medical [Member]
Segment Reporting Information [Line Items]
Net sales	3,029	2,496
Gross profit	793	594
Operating (loss) income	(2,387)	(2,344)
Interest expense, net	41	194
Depreciation and amortization	184	197
Stock-based compensation expense	531	400
Total assets	11,615	11,558
Expenditures for fixed assets		36
Industrial [Member]
Segment Reporting Information [Line Items]
Net sales	623	900
Gross profit	287	319
Operating (loss) income	(2)	40
Depreciation and amortization	4	7
Stock-based compensation expense	24	43
Total assets	1,679	1,646
Adjustments [Member]
Segment Reporting Information [Line Items]
Total assets	$ (2,224)	$ (2,016)