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Employee Benefit Plans (Tables)
 12 Months Ended
Apr. 30, 2020
Disclosure Text Block Supplement [Abstract]  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
The following table summarizes information about stock option and SARs activity for the years ended April 30, 2020 and 2019:


   

Stock Options and Stock Appreciation Rights

 
                 

Weighted Average

        
           

Weighted-

  

Remaining

        
           

Average

  

Contractual

  

Aggregate

  
   

Shares

    

Exercise Price

  

Term

  

Intrinsic Value

  

Outstanding – April 30, 2018

     1,488,000     $ 8.93  

3.7 years

        

Granted

     162,500       8.50            

Exercised

     (145,750

)

     5.95       $ 889,588  

Expired or Canceled

     (5,000

)

     9.55            

Outstanding – April 30, 2019

     1,499,750     $ 9.17  

3.0 years

   $ 6,660,150  

Granted

     -       -            

Exercised

     (171,250

)

     5.48         781,680  

Expired or Canceled

     (269,000

)

     9.26            

Outstanding – April 30, 2020

     1,059,500     $ 9.74  

2.2 years

   $ 5,416,783  

Exercisable

     896,275     $ 9.85  

2.1 years

   $ 4,739,209  

Available for future grants

     417,004