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Note 13 - Treasury Stock and Repurchase Program - Treasury Stock at Cost (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
 [1]
Balance, shares (in shares) 308,380 288,335 243,411 [1]  
Purchases effected in open market (in shares) 28,059 [2],[3] 20,045 [3] 44,924  
Balance, shares (in shares) 336,439 308,380 288,335  
Balance, total average cost assigned $ 4,135 $ 3,781 $ 3,040 [1]  
Purchases effected in open market [3] 608 [2] 354 741  
Balance, total average cost assigned $ 4,743 $ 4,135 $ 3,781  
Balance, average cost per share (in dollars per share) $ 13.41 $ 13.11 $ 12.49 [1]  
Purchases effected in open market (in dollars per share) [3] 21.68 [2] 17.67 16.51  
Balance, average cost per share (in dollars per share) $ 14.10 $ 13.41 $ 13.11  
Balance, aggregate purchase price remaining under the program $ 1,438 $ 255 $ 609 $ 1,350
[1] Included 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 $2 million repurchase program authorized in October 2018.
[3] Were acquired during the $3 million repurchase program authorized in September 2012.