Note 4. Advances from Customers (Detail) - Advances for Future Orders of Scopes and EndoSheath Technology (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011
Adjustments			$ (7)
Ending balance	93		93
Stryker [Member]
Beginning balance		2,840	117		4,433
Revenue recognized		(864)	(117)		(2,453)
Adjustments		(6)		[1]	(10)
Ending balance		1,970			1,970
Spineview [Member]
Beginning balance	161	1,179	420		1,255
Revenue recognized	(161)	(348)	(420)		(426)
Adjustments		(1)		[1]	1
Ending balance		830			830
Other Customer [Member]
Beginning balance		13	135		5
Additional advances received		35	8		44
Revenue recognized		(1)			(2)
Adjustments			(143)	[1]
Ending balance		47			47
Adjustments [Member] | Advances from Customers [Member]
Adjustments		(7)	(143)	[1]	(9)
Advances from Customers [Member]
Beginning balance	161	4,032	672		5,693
Additional advances received		35	8		44
Revenue recognized	(161)	(1,213)	(537)		(2,881)
Ending balance		$ 2,847			$ 2,847

[1] Amount reclassified to deferred revenue