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Note 11 - Treasury Stock and Repurchase Program (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 30, 2012
Jan. 31, 2011
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Jan. 31, 2017
Jan. 31, 2016
Sep. 19, 2012
Treasury Stock, Shares, Acquired [1]     8,747 32,714      
Treasury Stock, Value, Acquired, Cost Method     [1] $ 146,000 [1] $ 535,000 [1] $ 681,000 $ 609,000  
September 2012 Share Repurchase Program [Member]                
Stock Repurchase Program, Authorized Amount               $ 3,000,000
Former Repurchase Program [Member]                
Treasury Stock, Shares, Acquired 85,219              
Treasury Stock, Value, Acquired, Cost Method $ 1,036,000              
January 2011 Share Repurchase Program [Member]                
Treasury Stock, Shares, Acquired   18,400            
[1] Were acquired during the $3 million repurchase program authorized in September 2012.