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Stock Options and Share-Based Compensation (Tables)
 12 Months Ended
Apr. 30, 2021
Equity [Abstract]  
Summary of RSU Activity and Weighted Average Exercise Price The following table summarizes the RSU activity and weighted averages.
20212020
Number of RSUsWeighted Average Grant Date Fair ValueNumber of RSUsWeighted Average Grant Date Fair Value
Outstanding at beginning of year52,850 $20.08 23,308 $28.66 
Granted95,861 $9.43 39,781 $15.93 
Vested(11,477)$13.55 (2,397)$18.94 
Forfeited(12,017)$16.69 (7,842)$21.94 
Outstanding at end of year125,217 $12.71 52,850 $20.08 
Summary of Stock Option Activity and Weighted Average Exercise Price Stock option activity and weighted average exercise price are summarized as follows:
20212020
Number
of Shares		Weighted Average Exercise PriceNumber
of Shares		Weighted Average Exercise Price
Outstanding at beginning of year88,000 $18.45 104,350 $18.28 
Canceled(3,700)$15.97 (14,050)$17.78 
Exercised— $— (2,300)$14.98 
Outstanding at end of year84,300 $18.56 88,000 $18.45 
Exercisable at end of year84,300 $18.56 83,400 $18.16 
Summary of Options Outstanding, Exercisable, and Weighted Average Exercise Prices within Exercise Price Range
The number of options outstanding, exercisable, and their weighted average exercise prices were within the following ranges at April 30, 2021:
Exercise Price Range
$8.59-$11.78
$15.85-$23.62
Options outstanding5,150 79,150 
Weighted average exercise price$10.85 $19.06 
Weighted average remaining contractual life1.04 years4.17 years
Aggregate intrinsic value$5,918 $— 
Options exercisable5,150 79,150 
Weighted average exercise price$10.85 $19.06 
Aggregate intrinsic value$5,918 $—