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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Earnings [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Treasury Stock [Member]
Beginning Balance at Sep. 30, 2019 $ 368,819   $ 28 $ 269,969 $ (669) $ 202,455   $ (102,964)
Beginning Balance, Shares at Sep. 30, 2019     27,508,473          
Net income 9,059         9,059    
Shares issued pursuant to employee stock purchase plan 505     505        
Shares issued pursuant to employee stock purchase plan, Shares     38,352          
Shares issued upon vesting of equity awards, net of minimum tax withholding (476)     (476)        
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares     123,993          
Shares issued upon exercise of stock options 111     111        
Shares issued upon exercise of stock options, Shares     13,000          
Stock-based compensation 1,513     1,513        
Stock-based compensation, Shares     2,946          
Other comprehensive income 606       606      
Ending Balance at Dec. 31, 2019 380,747   $ 28 271,622 (63) 212,124   (102,964)
Ending Balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2019   $ 610         $ 610  
Ending Balance, Shares at Dec. 31, 2019     27,686,764          
Beginning Balance at Sep. 30, 2020 $ 455,397   $ 28 280,436 829 277,699   (103,595)
Beginning Balance, Shares at Sep. 30, 2020 28,130,312   28,130,312          
Net income $ 23,600         23,600    
Shares issued pursuant to employee stock purchase plan 740     740        
Shares issued pursuant to employee stock purchase plan, Shares     83,572          
Shares issued upon vesting of equity awards, net of minimum tax withholding (871)     (871)        
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares     121,303          
Shares issued upon exercise of stock options 783     783        
Shares issued upon exercise of stock options, Shares     56,746          
Stock-based compensation 2,013     2,013        
Stock-based compensation, Shares     1,777          
Other comprehensive income 920       920      
Ending Balance at Dec. 31, 2020 $ 482,582   $ 28 $ 283,101 $ 1,749 $ 301,299   $ (103,595)
Ending Balance, Shares at Dec. 31, 2020 28,393,710   28,393,710