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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, 2019
 [1]
Apr. 30, 2018
Apr. 30, 2017
Oct. 30, 2018
Oct. 19, 2018
Sep. 19, 2012
Treasury Stock, Shares, Acquired     28,059 [2] 20,045 [2] 44,924      
Treasury Stock, Value, Acquired, Cost Method [2]     $ 608,000 $ 354,000 $ 741,000      
October 2018 Share Repurchase Program [Member]                
Stock Repurchase Program, Authorized Amount           $ 2,000,000 $ 2,000,000  
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            
September 2012 Share Repurchase Program [Member]                
Stock Repurchase Program, Authorized Amount               $ 3,000,000
[1] Were acquired during the $2 million repurchase program authorized in October 2018.
[2] Were acquired during the $3 million repurchase program authorized in September 2012.