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Note 11 - Treasury Stock and Repurchase Program - Treasury Stock at Cost (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2018
Jul. 31, 2018
Oct. 31, 2018
Oct. 31, 2017
Apr. 30, 2018
 [1]
Balance, shares (in shares) [1]   308,380 308,380    
Balance, total average cost assigned [1]   $ 4,135 $ 4,135    
Balance, average cost per share (in dollars per share) [1]   $ 13.41 $ 13.41    
Balance, aggregate purchase price remaining under the program $ 209 [2],[3] $ 209 [2] $ 209 [2],[3]   $ 255
Purchases effected in open market (in shares) 2,286 [2]      
Purchases effected in open market, average cost assigned $ 46 [2] $ 46 $ 150  
Purchases effected in open market, average cost per share (in dollars per share) $ 20.26 [2]      
Balance, shares (in shares) [2],[3] 310,666   310,666    
Balance, total average cost assigned [2],[3] $ 4,181   $ 4,181    
Balance, average cost per share (in dollars per share) [2],[3] $ 13.46   $ 13.46    
[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 January 2011.
[2] Includes 207,047 shares with a total average cost of $2,792,000 that were acquired during the $3 million repurchase program which was authorized in September 2012 and expired in October 2019.
[3] On October 19, 2018, the Companys Board of Directors authorized the repurchases up to $2,000,000 of shares of the Companys common stock of which none were purchased through October 31, 2018.