Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Expense - Stock Options Outstanding, Exercisable and Intrinsic Value (Details)

v3.21.1
Stock-Based Compensation Expense - Stock Options Outstanding, Exercisable and Intrinsic Value (Details) - Stock Options - USD ($)
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Options outstanding (in shares) 111,401 137,352 327,439 365,624
Options outstanding, weighted average exercise price (in dollars per share) $ 16.53      
$12.00        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Options outstanding (in shares) 10,470      
Options outstanding, weighted average exercise price (in dollars per share) $ 12.00      
Options outstanding, aggregate intrinsic value $ 78,420      
Options vested and exercisable, number exercisable (in shares) 10,470      
Options vested and exercisable, weighted average exercise price (in dollars per share) $ 12.00      
Options vested and exercisable, aggregate intrinsic value $ (78,420)      
$14.28        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Options outstanding (in shares) 55,609      
Options outstanding, weighted average exercise price (in dollars per share) $ 14.28      
Options outstanding, aggregate intrinsic value $ 289,723      
Options vested and exercisable, number exercisable (in shares) 0      
Options vested and exercisable, weighted average exercise price (in dollars per share) $ 14.28      
Options vested and exercisable, aggregate intrinsic value $ 0      
$19.64        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Options outstanding (in shares) 28,499      
Options outstanding, weighted average exercise price (in dollars per share) $ 19.64      
Options outstanding, aggregate intrinsic value $ (4,275)      
Options vested and exercisable, number exercisable (in shares) 28,499      
Options vested and exercisable, weighted average exercise price (in dollars per share) $ 19.64      
Options vested and exercisable, aggregate intrinsic value $ 4,275      
$21.52        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Options outstanding (in shares) 16,823      
Options outstanding, weighted average exercise price (in dollars per share) $ 21.52      
Options outstanding, aggregate intrinsic value $ (34,150)      
Options vested and exercisable, number exercisable (in shares) 16,823      
Options vested and exercisable, weighted average exercise price (in dollars per share) $ 21.52      
Options vested and exercisable, aggregate intrinsic value $ 34,150      
$5.20 - $21.52        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Options outstanding (in shares) 111,401      
Options outstanding, aggregate intrinsic value $ 329,718      
Options vested and exercisable, number exercisable (in shares) 55,792      
Options vested and exercisable, weighted average exercise price (in dollars per share) $ 18.77      
Options vested and exercisable, aggregate intrinsic value $ (39,995)      
Minimum        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Exercise price $ 12.00      
Maximum        
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]        
Exercise price $ 21.52