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Consolidated Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands | Oct. 31, 2019 | Apr. 30, 2019
--- | --- | ---
Short term investments | $ 3,955 | $ 5,617 |
Allowance for doubtful accounts | $ 24 | $ 22 |
Common stock, par value (in dollars per share) | $ 0.10 | $ 0.10 |
Common stock, shares authorized (in shares) | 30,000,000 | 30,000,000 |
Common stock, shares issued (in shares) | 10,000,000 | 10,000,000 |
Treasury stock, shares (in shares) | 352,932 | 336,439 | [1],[2],[3]
[1] | Includes 207,047 shares that were acquired during the $3 million repurchase program which was authorized in September 2012 and expired in October 2018.
[2] | Includes 42,266 shares that were acquired during the $2 million repurchase program which was authorized in October 2018.
[3] | Includes 85,219 shares that were acquired during the former repurchase program which was authorized in January 2011 and expired in January 2012; 18,400 shares were acquired prior to January 2011.

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