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Consolidated Condensed Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified | Oct. 31, 2014 | Apr. 30, 2014
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Statement Of Financial Position [Abstract] |  |  |
Short term investments (in dollars) | $ 4,857 | $ 5,482 |
Allowance for doubtful accounts (in dollars) | $ 28 | $ 39 |
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 | 187,132 | 182,071 | [1],[2],[3]
[1] | Includes 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 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.
[3] | Includes 78,452 shares with a total average cost of $732,000 that were acquired during the current repurchase program authorized in September 2012.

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