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Treasury Stock and Repurchase Program (Detail Textuals) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2012 | Jan. 31, 2011 | Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013 | Sep. 19, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Number of treasury shares | [1] |  |  | 8,433 | 58,499 | 19,953 |
Total average cost | [1] |  |  | $ 122,000 | $ 550,000 | $ 182,000 |
September 2012 Share Repurchase Program |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Authorized repurchase amount of common stock |  |  |  |  |  |  | $ 3,000,000
January 2011 Share Repurchase Program |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Number of treasury shares |  |  | 18,400 |  |  |  |
Former Repurchase Program |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Number of treasury shares |  | 85,219 |  |  |  |  |
Total average cost |  | $ 1,036,000 |  |  |  |  |
[1] | Were acquired during the $3 million repurchase program authorized in September 2012.

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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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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