Note 3 - Intangible Assets and Goodwill (Tables)

9 Months Ended

Jan. 31, 2013

Schedule of Finite-Lived Intangible Assets [Table Text Block]

					January 31, 2013					April 30, 2012
Intangible Asset Description	Estimated Useful Lives				Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Patents, trademarks and copyrights		10	–	15	$	852	$	(388	)	$	852	$	(336	)
Customer relationships		5	–	15		1,040		(433	)		1,040		(386	)
Trade name		15				530		(191	)		530		(165	)
Technologies		13	–	15		475		(150	)		475		(124	)
					$	2,897	$	(1,162	)	$	2,897	$	(1,011	)

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Year	Amounts
2013 (remaining)	$	50
2014		202
2015		187
2016		166
2017		166