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Equity - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 21 Months Ended
Oct. 10, 2019
Nov. 01, 2019
Jan. 31, 2019
Jun. 30, 2016
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 12, 2019
Dec. 31, 2018
Jan. 31, 2018
Sep. 05, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Repurchases of common stock             $ 46,000 $ 41,000          
Effect of diluted securities (in shares)         200,000 0 0 200,000          
New Share Repurchase Program                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Beneficial interest purchased authorized amount                   $ 5,000,000     $ 5,000,000
Shares repurchased (in shares)             3,590 3,500          
Average market price of shares repurchased (in dollars per share)             $ 12.80 $ 11.73          
Repurchases of common stock             $ 46,000 $ 41,000          
Restricted Stock Units (RSUs)                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Compensation expense         $ 35,000 $ (274,000) 106,000 (128,000)          
Deferred unearned compensation         213,000   213,000   $ 213,000   $ 319,000    
Restricted Stock                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Compensation expense         337,000 $ 290,000 1,004,000 $ 801,000          
Deferred unearned compensation         $ 3,674,000   $ 3,674,000   $ 3,674,000   $ 2,735,000    
Remaining weighted average vesting period             2 years 4 months 24 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   600,000        
Incentive Plan 2018 | Restricted Stock                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Issued (in shares)     156,399                    
Shares outstanding (in shares)         725,296   725,296   725,296        
Incentive Plan 2016 | Restricted Stock Units (RSUs)                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Issued (in shares)       450,000                  
Vesting period for shares issued             5 years            
Incentive Plan 2016 | Restricted Stock                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting period for shares issued     5 years                    
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   0        
Subsequent Event                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Dividends declared per share (in dollars per share) $ 0.22                        
At-the-market                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Common stock issued in offering                       $ 30,000,000  
Shares sold in offering (in shares)         0       1,645,997        
Aggregate sales price                 $ 21,704,000        
Payments for commissions                 440,000        
Payments of offering related expenses                 $ 78,000        
At-the-market | Subsequent Event                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares sold in offering (in shares)   130,485                      
Aggregate sales price   $ 2,006,000                      
Payments for commissions   $ 40,000