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Quarterly Results (Unaudited)
 12 Months Ended
Sep. 30, 2021
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Results (Unaudited) Quarterly Results (Unaudited) The following table sets forth for the eight most recent quarters the selected unaudited quarterly consolidated statement of operations data. The unaudited quarterly consolidated statement of operations data has been prepared on the same basis as the Company's audited consolidated financial statements and, in the opinion of management, includes all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of this data.
 Three months ended
 Dec. 31,
2019		Mar. 31,
2020		June 30,
2020		Sept. 30,
2020		Dec. 31,
2020		Mar. 31,
2021		June 30,
2021		Sept. 30,
2021
 (in thousands, except share and per share data)
Revenue$49,504 $52,824 $47,722 $55,890 $55,751 $61,786 $69,666 $70,328 
Gross profit (excludes depreciation and amortization)$25,328 $26,205 $25,228 $33,163 $33,178 $35,401 $41,213 $40,061 
Income (loss) before income taxes$(4,738)$(4,195)$422 $5,538 $4,811 $5,667 $8,848 $8,253 
Net income (loss)$(5,196)$(4,238)$213 $5,447 $4,514 $5,260 $8,419 $32,756 
Basic income (loss) per common share$(0.15)$(0.13)$0.01 $0.16 $0.14 $0.16 $0.25 $0.98 
Diluted income (loss) per common share$(0.15)$(0.13)$0.01 $0.16 $0.13 $0.15 $0.24 $0.93 
Basic weighted average shares outstanding33,545,235 33,624,889 33,695,936 33,584,040 33,176,895 33,491,395 33,371,906 33,297,879 
Diluted weighted average shares outstanding33,545,235 33,624,889 33,815,332 33,986,862 34,911,119 35,559,747 35,437,761 35,294,326