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Consolidated Condensed Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Jul. 31, 2015
Apr. 30, 2015
Statement Of Financial Position [Abstract]    
Short term investments (in dollars) $ 5,605 $ 5,272
Allowance for doubtful accounts (in dollars) $ 28 $ 28
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 202,741 190,504 [1],[2]
[1] 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 the repurchase program authorized in January 2011.
[2] Were acquired during the $3 million repurchase program authorized in September 2012.