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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Financial information by business segments
Revenues from external customers	$ 27,450	$ 21,574	$ 85,318	$ 73,857
Operating earnings (loss) before income taxes	959	(136)	3,239	(251)
Domestic Operations [Member]
Financial information by business segments
Revenues from external customers	20,445	17,142	68,757	64,364
Intersegment revenues	2,415	1,369	3,833	1,770
Operating earnings (loss) before income taxes	1,009	233	4,331	1,600
International Operations [Member]
Financial information by business segments
Revenues from external customers	7,005	4,432	16,561	9,493
Intersegment revenues	454	511	1,876	777
Operating earnings (loss) before income taxes	992	504	2,022	704
Corporate [Member]
Financial information by business segments
Intersegment revenues	(2,869)	(1,880)	(5,709)	(2,547)
Operating earnings (loss) before income taxes	$ (1,042)	$ (873)	$ (3,114)	$ (2,555)

X

- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 5

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X

- Definition

Amount of revenue from external customers for the reportable segment. Such disclosure is presented if the amount is: (a) included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 27

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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X

- Definition

Amount of revenue from transactions with other operating segments of the same entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 27

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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