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Note 13 - Treasury Stock and Repurchase Program (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 30, 2012
Jan. 31, 2011
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Sep. 19, 2012
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        
Treasury Stock, Shares, Acquired [1]     52,907 8,433 58,499  
Treasury Stock, Value, Acquired, Cost Method [1]     $ 796,000 $ 122,000 $ 550,000  
[1] Were acquired during the $3 million repurchase program authorized in September 2012.