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Note 13 - Schedule of Treasury Stock, at Cost (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Balance as of April 30, 2013 (1) (in shares) 190,504 182,071 123,572 [1]
Balance as of April 30, 2013 (1) $ 2,244 $ 2,122 $ 1,572 [1]
Balance as of April 30, 2013 (1) (in dollars per share) $ 11.78 $ 11.65 $ 12.72 [1]
Balance as of April 30, 2013 (1) $ 2,146 $ 2,268 $ 2,818 [1]
Purchases effected in open market (2) (in shares) [2] 52,907 8,433 58,499
Treasury Stock, Value, Acquired, Cost Method [2] $ 796 $ 122 $ 550
Purchases effected in open market (2) (in dollars per share) [2] $ 15.05 $ 14.47 $ 9.41
Balance as of April 30, 2014 (in shares) 243,411 190,504 182,071
Balance as of April 30, 2014 $ 3,040 $ 2,244 $ 2,122
Balance as of April 30, 2014 (in dollars per share) $ 12.49 $ 11.78 $ 11.65
Balance as of April 30, 2014 $ 1,350 $ 2,146 $ 2,268
[1] During the fourth quarter ended April 30, 2016, the Company's loss from operations of $462,000 was the result of accelerated amortization related to the cessation of software development for certain data galleries.
[2] Were acquired during the $3 million repurchase program authorized in September 2012.