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CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Income Statement [Abstract] |  |  |  |
Revenues | $ 168,679 | $ 164,304 | $ 343,993 | $ 318,631
Cost of revenues | 147,708 | 144,503 | 299,265 | 277,702
Gross profit | 20,971 | 19,801 | 44,728 | 40,929
General and administrative expenses | (16,821) | (14,771) | (33,934) | (29,202)
Gain on sale of equipment, net | 435 | 693 | 744 | 1,027
Operating income | 4,585 | 5,723 | 11,538 | 12,754
Interest expense, net | (1,834) | (379) | (2,115) | (894)
Other income (expense) | (753) | 123 | (688) | 106
Income before provision for income taxes and earnings from investment in joint venture | 1,998 | 5,467 | 8,735 | 11,966
Provision for income taxes | 531 | 1,488 | 1,850 | 3,139
Earnings from investment in joint venture | 70 | 233 | 113 | 539
Net income | $ 1,537 | $ 4,212 | $ 6,998 | $ 9,366
Net income per share attributable to common stockholders: |  |  |  |
Basic (in dollars per share) | $ 0.03 | $ 0.08 | $ 0.14 | $ 0.18
Diluted (in dollars per share) | $ 0.03 | $ 0.08 | $ 0.14 | $ 0.18
Weighted average number of common shares outstanding: |  |  |  |
Basic (in shares) | 51,489,211 | 51,414,619 | 51,489,211 | 51,414,619
Diluted (in shares) | 51,619,403 | 51,414,619 | 51,612,340 | 51,414,619

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