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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Treasury Stock
Noncontrolling Interests
Common stock, beginning balance (in shares) at Sep. 30, 2020   9,074,569        
Beginning balance at Sep. 30, 2020 $ 152,307 $ 91 $ 51,833 $ 100,797 $ 0 $ (414)
Treasury stock, beginning balance (in shares) at Sep. 30, 2020         0  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Purchase of treasury shares (in shares)         (74,569)  
Purchase of treasury shares (1,794)       $ (1,794)  
Canceled treasury shares (in shares)   (74,659)     (74,569)  
Canceled treasury shares 0 $ (1) (1,793)   $ 1,794  
Payment of dividends (1,440)     (1,440)    
Net income (loss) 30,150     30,336   (186)
Common stock, ending balance (in shares) at Sep. 30, 2021   8,999,910        
Ending balance at Sep. 30, 2021 179,223 $ 90 50,040 129,693 $ 0 (600)
Treasury stock, ending balance (in shares) at Sep. 30, 2021         0  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common shares for business combination (in shares)   500,000        
Issuance of common shares for business combination 29,933 $ 5 29,928      
Purchase of treasury shares (in shares)         (268,185)  
Purchase of treasury shares (15,097)       $ (15,097)  
Canceled treasury shares (in shares)   (268,185)     (268,185)  
Canceled treasury shares 0 $ (3) (15,094)   $ 15,097  
Payment of dividends (1,784)     (1,784)    
Stock-based compensation expense 2,353   2,353      
Investment from noncontrolling partner 1,070         1,070
Net income (loss) $ 46,060     46,041   19
Common stock, ending balance (in shares) at Sep. 30, 2022 9,231,725 9,231,725        
Ending balance at Sep. 30, 2022 $ 241,758 $ 92 67,227 173,950 $ 0 489
Treasury stock, ending balance (in shares) at Sep. 30, 2022         0  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common shares for business combination (in shares)   200,000        
Issuance of common shares for business combination 12,847 $ 2 12,845      
Purchase of treasury shares (in shares)         (34,086)  
Purchase of treasury shares (2,223)       $ (2,223)  
Canceled treasury shares (in shares)   (34,086)     (34,086)  
Canceled treasury shares 0   (2,223)   $ 2,223  
Payment of dividends (2,146)     (2,146)    
Stock-based compensation expense 2,588   2,588      
Share in return of investment by noncontrolling partner (600)         (600)
Net income (loss) $ 29,100     29,246   (146)
Common stock, ending balance (in shares) at Sep. 30, 2023 9,397,639 9,397,639        
Ending balance at Sep. 30, 2023 $ 281,324 $ 94 $ 80,437 $ 201,050 $ 0 $ (257)
Treasury stock, ending balance (in shares) at Sep. 30, 2023         0