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Treasury Stock and Repurchase Program (Detail Textuals) (USD $) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | Sep. 19, 2012 September 2012 Share Repurchase Program | Jan. 20, 2011 January 2011 Share Repurchase Program | Jan. 31, 2012 Former Repurchase Program
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Authorized repurchase amount of common stock |  |  |  |  | $ 3,000,000 | $ 3,200,000 |
Number of treasury shares | 19,953 | [1] | 78,500 | 6,719 |  |  | 85,219
Total average cost | $ 182,000 | [1] | $ 946,000 | $ 90,000 |  |  | $ 1,036,000
[1] | Were acquired during the new repurchase program authorized in September 2012.

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- Definition Amount of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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