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Stock-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended 24 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2022
Oct. 31, 2021
Apr. 30, 2014
Stock-Based Compensation Plans            
Number of common shares reserved for issuance under the Equity Incentive Plan         2,015,000 2,850,000
Restricted stock awards            
Stock-Based Compensation Plans            
Granted (in shares) 263,686 442,215        
Unrecognized compensation cost $ 1.7     $ 1.7    
Weighted average life over which unrecognized compensation is expected to be recognized 1 year 9 months 18 days          
Fair value of restricted shares $ 4.1 $ 3.4 $ 5.2      
Number of Shares            
Unvested at the beginning of the period (in shares) 358,171 317,048   317,048    
Granted (in shares) 263,686 442,215        
Vested (in shares) (288,667) (400,942)        
Forfeited (in shares) (4,100) (150)        
Unvested at the end of the period (in shares) 329,090 358,171 317,048 329,090    
Weighted-Average Grant-Date Fair Value            
Unvested at the beginning of the period (in dollars per share) $ 8.23 $ 8.08   $ 8.08    
Granted (in dollars per share) 13.34 8.34        
Vested (in dollars per share) 10.21 8.23        
Forfeited (in dollars per share) 10.24 8.36        
Unvested at the end of the period (in dollars per share) $ 10.56 $ 8.23 $ 8.08 $ 10.56    
Restricted stock awards | General and administrative expenses            
Stock-Based Compensation Plans            
Stock-based compensation expense $ 3.3 $ 3.4 $ 3.2      
Restricted stock awards | Vest immediately            
Stock-Based Compensation Plans            
Vesting (as a percent)     25.00%      
Restricted stock awards | Vest one year after grant            
Stock-Based Compensation Plans            
Vesting (as a percent)     25.00%      
Vesting period     1 year      
Restricted stock awards | Vest two years after grant            
Stock-Based Compensation Plans            
Vesting (as a percent)     25.00%      
Vesting period     2 years      
Restricted stock awards | Vest three years after grant            
Stock-Based Compensation Plans            
Vesting (as a percent)     25.00%      
Vesting period     3 years      
Restricted stock units | Vest one year after grant            
Stock-Based Compensation Plans            
Vesting (as a percent)     33.00%      
Vesting period     1 year      
Restricted stock units | Vest two years after grant            
Stock-Based Compensation Plans            
Vesting (as a percent)     33.00%      
Vesting period     2 years      
Restricted stock units | Vest three years after grant            
Stock-Based Compensation Plans            
Vesting (as a percent)     33.00%      
Vesting period     3 years      
Certain officers and employees | Restricted stock awards            
Stock-Based Compensation Plans            
Granted (in shares) 180,900 188,400 175,200      
Number of Shares            
Granted (in shares) 180,900 188,400 175,200      
Certain officers and employees | Restricted stock units            
Stock-Based Compensation Plans            
Granted (in shares) 36,700 56,450 22,500      
Minimum percent of weighted average price of common shares over any consecutive 15 day period of book value of one share of the company 95.00%          
Number of Shares            
Granted (in shares) 36,700 56,450 22,500      
Non-executive director | Restricted stock awards            
Stock-Based Compensation Plans            
Granted (in shares) 46,086 41,711 24,025      
Number of Shares            
Granted (in shares) 46,086 41,711 24,025      
President and Chief Executive Officer            
Stock-Based Compensation Plans            
Shares issued   155,654        
Non-employee consultant | Restricted stock awards            
Stock-Based Compensation Plans            
Granted (in shares)     1,550 0    
Number of Shares            
Granted (in shares)     1,550 0