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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Stock Options
Common Stock
Common Stock
Stock Options
Retained Earnings
Accumulated Other Comprehensive Loss
Balance at beginning of period (in shares) at Sep. 30, 2019     8,329,419      
Balance at beginning of period at Sep. 30, 2019 $ 171,067   $ 43,030   $ 127,987 $ 50 [1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 11,701       11,701  
Other comprehensive income (loss) (229)         (229)
Repurchase of common stock (in shares)     (56,601)      
Repurchase of common stock $ (1,238)   $ (1,238)      
Exercise of stock options (in shares) 36,375   36,375      
Exercise of stock options $ 374   $ 374      
Common stock dividends (3,759)       (3,759)  
Stock option compensation expense   $ 92   $ 92    
Balance at end of period (in shares) at Mar. 31, 2020     8,309,193      
Balance at end of period at Mar. 31, 2020 178,008   $ 42,258   135,929 (179) [1]
Balance at beginning of period (in shares) at Dec. 31, 2019     8,346,394      
Balance at beginning of period at Dec. 31, 2019 175,653   $ 43,246   132,553 (146) [1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 5,049       5,049  
Other comprehensive income (loss) (33)         (33)
Repurchase of common stock (in shares)     (56,601)      
Repurchase of common stock (1,238)   $ (1,238)      
Exercise of stock options (in shares)     19,400      
Exercise of stock options 204   $ 204      
Common stock dividends (1,673)       (1,673)  
Stock option compensation expense   46   46    
Balance at end of period (in shares) at Mar. 31, 2020     8,309,193      
Balance at end of period at Mar. 31, 2020 178,008   $ 42,258   135,929 (179) [1]
Balance at beginning of period (in shares) at Sep. 30, 2020     8,310,793      
Balance at beginning of period at Sep. 30, 2020 187,630 [2]   $ 42,396   145,173 61 [1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 14,541       14,541  
Other comprehensive income (loss) 60         60
Repurchase of common stock (in shares)     (2,900)      
Repurchase of common stock $ (58)   $ (58)      
Exercise of stock options (in shares) 53,564   53,564      
Exercise of stock options $ 519   $ 519      
Common stock dividends (4,241)       (4,241)  
Stock option compensation expense   92   92    
Balance at end of period (in shares) at Mar. 31, 2021     8,361,457      
Balance at end of period at Mar. 31, 2021 198,543   $ 42,949   155,473 121 [1]
Balance at beginning of period (in shares) at Dec. 31, 2020     8,317,793      
Balance at beginning of period at Dec. 31, 2020 193,325   $ 42,480   150,801 44 [1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 7,251       7,251  
Other comprehensive income (loss) 77         77
Exercise of stock options (in shares)     43,664      
Exercise of stock options 423   $ 423      
Common stock dividends (2,579)       (2,579)  
Stock option compensation expense   $ 46   $ 46    
Balance at end of period (in shares) at Mar. 31, 2021     8,361,457      
Balance at end of period at Mar. 31, 2021 $ 198,543   $ 42,949   $ 155,473 $ 121 [1]
[1] All amounts are net of income taxes.
[2] Derived from audited consolidated financial statements.