Note 9. Segment Information (Details) - Key Financial Highlights By Reportable Segments (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Mar. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 3,968		$ 3,739	$ 7,620		$ 7,135
Gross profit	1,195		1,070	2,275		1,983
Operating (loss) income	(1,283)		(2,621)	(3,672)		(4,925)
Interest expense, net	(43)		(236)	(84)		(429)
Depreciation and amortization	173		202	362		406
Stock-based compensation expense	(227)	[1]	569	328	[1]	1,012
Total assets	10,733		12,530	10,733		12,530	11,377
Expenditures for fixed assets	46		19	46		55
Medical [Member]
Segment Reporting Information [Line Items]
Net sales	3,399		2,724	6,428		5,220
Gross profit	981		746	1,774		1,341
Operating (loss) income	(1,345)		(2,688)	(3,732)		(5,032)
Interest expense, net	(43)		(236)	(84)		(429)
Depreciation and amortization	170		196	355		393
Stock-based compensation expense	(221)	[1]	560	309	[1]	960
Total assets	11,240		12,751	11,240		12,751
Expenditures for fixed assets	46		19	46		55
Industrial [Member]
Segment Reporting Information [Line Items]
Net sales	569		1,015	1,192		1,915
Gross profit	214		324	501		642
Operating (loss) income	62		67	60		107
Depreciation and amortization	3		6	7		13
Stock-based compensation expense	(6)	[1]	9	19	[1]	52
Total assets	1,333		1,753	1,333		1,753
Adjustments [Member]
Segment Reporting Information [Line Items]
Stock-based compensation expense		[1]			[1]
Total assets	$ (1,840)		$ (1,974)	$ (1,840)		$ (1,974)

[1] Reflects reversal of stock-based compensation expense of $289 thousand for the cancellation of unvested stock options granted to our former President and Chief Executive Officer, Cynthia F. Ansari.