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Share-Based Compensation Plan (Details) - The 2018 LTIP - USD ($)
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
May 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) 132,486   150,000
Compensation expense $ 100,000    
Accrued dividends $ 11,600 $ 10,000  
Restricted stock unit awards      
Number of Shares      
Restricted stock unit awards at January 1, 2018 (in shares) 13,733    
Granted (in shares) 0    
Vested (in shares) (375)    
Forfeited (in shares) 0    
Restricted stock unit awards at September 30, 2018 (in shares) 13,358    
Weighted Average Grant Date Fair Value per Share      
Restricted stock unit awards at January 1, 2018 (in dollars per share) $ 43.00    
Granted (in dollars per share) 0    
Vested (in dollars per share) 43.00    
Forfeited (in dollars per share) $ 0    
Unrecognized compensation cost $ 300,000    
Period for recognition for remaining compensation cost 1 year 6 months    
Performance Unit Awards      
Number of Shares      
Restricted stock unit awards at January 1, 2018 (in shares) 3,966    
Granted (in shares) 0    
Performance factor decrease (in shares) (185)    
Vested (in shares) 0    
Forfeited (in shares) 0    
Restricted stock unit awards at September 30, 2018 (in shares) 3,781    
Weighted Average Grant Date Fair Value per Share      
Restricted stock unit awards at January 1, 2018 (in dollars per share) $ 43.00    
Granted (in dollars per share) 0    
Performance factor decrease (in dollars per share) 43.00    
Vested (in dollars per share) 0    
Forfeited (in dollars per share) $ 0    
Performance factor 47.50%    
Unrecognized compensation cost $ 100,000    
Period for recognition for remaining compensation cost 2 years 2 months 12 days