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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, 2021
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Balance, shares (in shares) 383,279 336,439 308,380  
Balance, total average cost assigned $ 5,957 $ 4,743 $ 4,135  
Balance, average cost per share (in dollars per share) $ 15.54 $ 14.10 $ 13.41  
Balance, aggregate purchase price remaining under the program $ 474 $ 2,000 $ 1,438 $ 255
Purchases effected in open market, shares (in shares) 53,551 [1] 46,840 28,059  
Purchases effected in open market, cost $ 1,526 [1] $ 1,214 $ 608  
Purchases effected in open market, average cost (in dollars per share) $ 28.50 [1] $ 25.91 $ 21.68  
Balance, shares (in shares) 436,830 383,279 336,439  
Balance, total average cost assigned $ 7,483 $ 5,957 $ 4,743  
Balance, average cost per share (in dollars per share) $ 17.13 $ 15.54 $ 14.10  
[1] Were acquired during the $2 million repurchase program authorized in April 2020.