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Note 11 - Treasury Stock and Repurchase Program - Schedule of Treasury Stock, at Cost (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Jan. 31, 2017
Jan. 31, 2016
Apr. 30, 2016
 [1]
Balance, shares (in shares) [1],[2]     243,411 243,411    
Balance, total average cost assigned [1],[2]     $ 3,040 $ 3,040    
Balance, average cost per share (in dollars per share) [1],[2]     $ 12.49 $ 12.49    
Balance, aggregate purchase price remaining under the program [2] $ 669 $ 669 $ 815 $ 669   $ 1,350
Treasury Stock, Shares, Acquired [2] 8,747 32,714      
Treasury Stock, Value, Acquired, Cost Method [2] $ 146 [2] $ 535 [2] $ 681 $ 609  
Purchases effected in open market, average cost per share (in dollars per share) [2] $ 16.68 $ 12.95      
Balance, shares (in shares) 284,872     284,872    
Balance, total average cost assigned $ 3,721     $ 3,721    
Balance, average cost per share (in dollars per share) $ 13.06     $ 13.06    
[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] Were acquired during the $3 million repurchase program authorized in September 2012.