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Treasury Stock and Repurchase Program - Components of treasury stock, at cost (Parentheticals) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2012 | Jan. 31, 2011 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Jan. 31, 2016 | Jan. 31, 2015 | Sep. 19, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of treasury shares (in shares) | [1] |  |  | 4,118 |  | 25,098 |  | 12,237 |  |  |  |
Total average cost |  |  |  | $ 61,000 | [1] | $ 382,000 | [1] | $ 166,000 | [1] | $ 609,000 | $ 71,000 |
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 (in shares) |  |  | 18,400 |  |  |  |  |  |  |  |  |
Former Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of treasury shares (in 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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