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Consolidated Condensed Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified | Jan. 31, 2013 | Apr. 30, 2012
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Statement Of Financial Position [Abstract] |  |  |
Short term investments (in dollars) | $ 7,751 | $ 10,848 |
Allowance for doubtful accounts (in dollars) | $ 35 | $ 44 |
Common stock, par value (in dollars per share) | $ 0.10 | $ 0.10 |
Common stock, shares authorized | 30,000,000 | 30,000,000 |
Common stock, shares issued | 10,000,000 | 10,000,000 |
Treasury stock, shares | 119,949 | 103,619 | [1],[2]
[1] | Includes the balance of 18,400 shares with a total average cost of $354,000 that were acquired prior to the repurchase program authorized in January 2011.
[2] | Includes the balance of 85,219 shares with a total average cost of $1,036,000 that were acquired during the former repurchase program, which was authorized in January 2011 and expired in January 2012.

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- Definition Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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