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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 3 months ended Dec. 31, 2018 - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Beginning Balance at Sep. 30, 2018 $ 353,092 $ 27 $ 262,250 $ 166,071 $ (75,256)
Beginning Balance, Shares at Sep. 30, 2018 27,141,267 27,141,267      
Net income $ 4,910     4,910  
Purchase of treasury stock (229)       (229)
Shares issued pursuant to employee stock purchase plan 507   507    
Shares issued pursuant to employee stock purchase plan, Shares   30,650      
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   35,000      
Shares issued upon exercise of stock options 1,311   1,311    
Shares issued upon exercise of stock options, Shares   108,275      
Stock-based compensation 1,448   1,448    
Stock-based compensation, Shares   2,135      
Cumulative effect of change in accounting principle - revenue recognition, net of tax 399     399  
Ending Balance at Dec. 31, 2018 $ 361,438 $ 27 $ 265,516 $ 171,380 $ (75,485)
Ending Balance, Shares at Dec. 31, 2018 27,317,327 27,317,327