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Consolidated Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands | Oct. 31, 2018 | Apr. 30, 2018
--- | --- | ---
Short term investments | $ 3,726 |  | $ 4,982 |
Allowance for doubtful accounts | $ 17 |  | $ 14 |
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) | 310,666 | [1],[2] | 308,380 | [3]
[1] | Includes 207,047 shares with a total average cost of $2,792,000 that were acquired during the $3 million repurchase program which was authorized in September 2012 and expired in October 2019.
[2] | On October 19, 2018, the Companys Board of Directors authorized the repurchases up to $2,000,000 of shares of the Companys common stock of which none were purchased through October 31, 2018.
[3] | 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; 18,400 shares were acquired prior to January 2011.

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