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Unaudited Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2017 7,287,500      
Balance at Dec. 31, 2017 $ 73 $ 6,987 $ 62,116  
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss)     19,438 $ 19,438
Capital contribution   137    
Common stock issued, net of offering costs (in shares) 2,900,000      
Common stock issued, net of offering costs $ 29 50,125    
Reclassification of undistributed S Corporation earnings   22,872 (22,872)  
Shares issued for restricted stock units (in shares) 0      
Shares acquired and canceled (in shares) 0      
Shares acquired and canceled $ 0   0  
Stock-based compensation expense   15    
Cash dividends declared ($0.10, $0.60, $0.10, $7.71 per share)     (56,155)  
Balance (in shares) at Sep. 30, 2018 10,187,500      
Balance at Sep. 30, 2018 $ 102 80,136 2,527 82,765
Balance (in shares) at Jun. 30, 2018 7,287,500      
Balance at Jun. 30, 2018 $ 73 6,987 70,493  
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss)     6,710 6,710
Capital contribution   137    
Common stock issued, net of offering costs (in shares) 2,900,000      
Common stock issued, net of offering costs $ 29 50,125    
Reclassification of undistributed S Corporation earnings   22,872 (22,872)  
Shares issued for restricted stock units (in shares) 0      
Shares acquired and canceled (in shares) 0      
Shares acquired and canceled $ 0   0  
Stock-based compensation expense   15    
Cash dividends declared ($0.10, $0.60, $0.10, $7.71 per share)     (51,804)  
Balance (in shares) at Sep. 30, 2018 10,187,500      
Balance at Sep. 30, 2018 $ 102 80,136 2,527 82,765
Balance (in shares) at Dec. 31, 2018 10,187,500      
Balance at Dec. 31, 2018 $ 102 80,275 8,089 88,466
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss)     3,723 3,723
Capital contribution   0    
Common stock issued, net of offering costs (in shares) 0      
Common stock issued, net of offering costs $ 0 0    
Reclassification of undistributed S Corporation earnings   0 0  
Shares issued for restricted stock units (in shares) 19,431      
Shares acquired and canceled (in shares) (149,425)      
Shares acquired and canceled $ (1)   (2,645)  
Stock-based compensation expense   12,078    
Cash dividends declared ($0.10, $0.60, $0.10, $7.71 per share)     (1,006)  
Balance (in shares) at Sep. 30, 2019 10,057,506      
Balance at Sep. 30, 2019 $ 101 92,353 8,161 100,615
Balance (in shares) at Jun. 30, 2019 10,187,500      
Balance at Jun. 30, 2019 $ 102 80,604 18,331  
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss)     (6,519) (6,519)
Capital contribution   0    
Common stock issued, net of offering costs (in shares) 0      
Common stock issued, net of offering costs $ 0 0    
Reclassification of undistributed S Corporation earnings   0 0  
Shares issued for restricted stock units (in shares) 19,431      
Shares acquired and canceled (in shares) (149,425)      
Shares acquired and canceled $ (1)   (2,645)  
Stock-based compensation expense   11,749    
Cash dividends declared ($0.10, $0.60, $0.10, $7.71 per share)     (1,006)  
Balance (in shares) at Sep. 30, 2019 10,057,506      
Balance at Sep. 30, 2019 $ 101 $ 92,353 $ 8,161 $ 100,615