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Note 13 - Treasury Stock and Repurchase Program - Schedule of Treasury Stock, at Cost (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
 [1]
Balance, shares (in shares) 243,411 190,504 182,071 [1]  
Balance, total average cost assigned $ 3,040 $ 2,244 $ 2,122 [1]  
Purchases effected in open market (2) (in shares) [2] 44,924 52,907 8,433  
Purchases effected in open market (2) [2] $ 741 $ 796 $ 122  
Purchases effected in open market (2) (in dollars per share) [2] $ 16.51 $ 15.05 $ 14.47  
Balance, average cost per share (in dollars per share) 12.49 11.78 11.65 [1]  
Balance, average cost per share (in dollars per share) $ 13.11 $ 12.49 $ 11.78  
Balance, aggregate purchase price remaining under the program $ 609 [2] $ 1,350 [2] $ 2,146 [2] $ 2,268
Balance, shares (in shares) 288,335 243,411 190,504  
Balance, total average cost assigned $ 3,781 $ 3,040 $ 2,244  
[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.