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Share-based Payments (Tables)
 3 Months Ended
Jun. 30, 2022
Share-based Payments [Abstract]  
Stock Option Transactions
The following is a summary of stock option transactions:

 
  
Number of
Shares
    
Weighted Average
Exercise Price
  
Outstanding at March 31, 2022
    
1,695,499
    
$
17.53
  
Granted
    
-
    
$
-
  
Exercised
    
(25,543
)
  
$
7.46
  
Forfeited/Cancelled
    
(60,723
)
  
$
15.73
  
Expired     (3,000 )   $ 9.85  
Outstanding at June 30, 2022
    
1,606,233
    
$
17.76
  
Restricted Stock Units Activity
The following is a summary of non-vested RSUs:

 
  
Number of
Shares
    
Weighted Average
Grant Date Fair
Value
  
Outstanding at March 31, 2022
    
399,063
    
$
19.98
  
Granted
    
276,590
    
$
13.14
  
Vested
    
(149,313
)
  
$
20.63
  
Forfeited/Cancelled
    
(41,293
)
  
$
20.72
  
Outstanding at June 30, 2022
    
485,047
    
$
15.82
  
Monte Carlo Valuation Model Assumptions used in Determining Fair Value of TSR Awards
The following table summarizes the assumptions used in determining the fair value of the TSR awards:

   
Three Months Ended
June 30,
  
   
2022
    
2021
  
Risk free interest rate
    
3.35
%
    
0.47
%
Expected life in years
     3       3  
Expected volatility of MPA common stock
    
51.30
%
    
53.70
%
Expected average volatility of peer companies
    
62.70
%
    
59.30
%
Average correlation coefficient of peer companies
    
27.50
%
    
26.70
%
Expected dividend yield
    
-
      
-
  
Grant date fair value
  
$
16.02
    
$
26.89
  
Performance Stock Units Activity
The following is a summary of non-vested PSUs:

 
  
Number of
Shares
    
Weighted Average
Grant Date Fair
Value
  
Outstanding at March 31, 2022
    
84,593
    
$
23.19
  
Granted
    
126,028
    
$
14.00
  
Vested
    
-
    
$
-
  
Forfeited
    
-
    
$
-
  
Outstanding at June 30, 2022
    
210,621
    
$
17.70