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Note 11 - Treasury Stock and Repurchase Program - Treasury Stock at Cost (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2020
Jul. 31, 2020
Oct. 31, 2020
Oct. 31, 2019
Apr. 30, 2020
Balance, shares (in shares)   383,279 383,279    
Balance, total average cost assigned   $ 5,957 $ 5,957    
Balance, average cost per share (in dollars per share) $ 15.99   $ 15.99   $ 15.54
Balance, aggregate purchase price remaining under the program $ 1,578 $ 2,000 $ 1,578   $ 2,000
Purchases effected in open market, shares (in shares) 15,670      
Purchases effected in open market, total average cost assigned $ 422 $ 422 $ 393  
Purchases effected in open market, average cost per share (in dollars per share) $ 26.96      
Balance, shares (in shares) 398,949   398,949    
Balance, total average cost assigned $ 6,379   $ 6,379