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Equity - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 04, 2019
Jan. 31, 2019
Jun. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Sep. 30, 2018
Jan. 31, 2018
Sep. 05, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares repurchased (in shares)       10,274          
Average market price of shares repurchased (in dollars per share)       $ 11.73          
Value of shares repurchased       $ 120,473          
Effect of diluted securities (in shares)       200,000 200,000        
New Share Repurchase Program                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Beneficial interest purchased authorized amount                 $ 5,000,000
Restricted Stock Units (RSUs)                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation expense       $ 35,000 $ 72,000        
Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation expense       288,000 $ 243,000        
Deferred unearned compensation       $ 2,735,000   $ 2,735,000 $ 3,023,000    
Remaining weighted average vesting period       2 years 1 month 6 days          
Incentive Plan 2018                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized (in shares)       600,000   600,000      
Incentive Plan 2018 | Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares outstanding (in shares)       705,847   705,847      
Incentive Plan 2016 | Restricted Stock Units (RSUs)                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Issued (in shares)     450,000            
Contingently issuable shares included in diluted earnings calculation (in shares)       200,000          
Vesting period for shares issued       5 years          
Deferred unearned compensation       $ 319,000   $ 319,000 $ 354,000    
Prior Plan | Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of additional awards available for grant (in shares)       0   0      
Private placement                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock issued in offering               $ 30,000,000  
Aggregate sales price           $ 20,913,000      
At-the-market                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares sold in offering (in shares)       0   1,590,935      
Subsequent Event                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Dividends declared per share (in dollars per share) $ 0.20                
Subsequent Event | Incentive Plan 2018 | Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Issued (in shares)   156,399              
Subsequent Event | Incentive Plan 2016 | Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting period for shares issued   5 years