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Stock-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Stock-Based Compensation Plans          
Unrecognized compensation cost   $ 2.8   $ 2.8  
Weighted average life over which unrecognized compensation is expected to be recognized       1 year 3 months 18 days  
General and administrative expenses          
Stock-Based Compensation Plans          
Stock-based compensation expense   $ 1.3 $ 0.4 $ 1.9 $ 2.3
Restricted stock awards          
Stock-Based Compensation Plans          
Granted (in shares)       217,600  
Number of Shares          
Unvested at the beginning of the period (in shares)       358,171  
Granted (in shares)       217,600  
Vested (in shares)       (239,581)  
Forfeited (in shares)       (4,100)  
Unvested at the end of the period (in shares)   332,090   332,090  
Weighted-Average Grant-Date Fair Value          
Unvested at the beginning of the period (in dollars per share)       $ 8.23  
Granted (in dollars per share)       13.10  
Vested (in dollars per share)       9.38  
Forfeited (in dollars per share)       10.24  
Unvested at the end of the period (in dollars per share)   $ 10.56   $ 10.56  
Certain officers and employees | Restricted stock awards          
Stock-Based Compensation Plans          
Granted (in shares) 180,900        
Number of Shares          
Granted (in shares) 180,900        
Certain officers and employees | Restricted stock units          
Stock-Based Compensation Plans          
Granted (in shares) 36,700        
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