Consolidated Statements of Income Unaudited - USD ($)	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenue	$ 49,114,139	$ 32,547,603
Cost of revenues	45,279,294	30,572,149
Gross profit	3,834,845	1,975,454
Selling and administrative expenses	2,756,391	2,009,091
Income (loss) from operations	1,078,454	(33,637)
Other income (expense)
Interest income	41,522	132,281
Other nonoperating expense	(32,995)	(55,124)
Interest expense	(204,349)	(295,844)
Gain on sale of equipment	25,752	368,705
Other income (expense), Total	(170,070)	150,018
Income before income taxes	908,384	116,381
Income tax expense (benefit)	277,000	(32,119)
Net income	631,384	148,500
Dividends on preferred stock	77,250	77,250
Net income available to common shareholders	$ 554,134	$ 71,250
Weighted average shares outstanding-basic (in shares)	14,135,900	14,239,836
Weighted average shares-diluted (in shares)	17,569,233	17,673,169
Earnings per share available to common shareholders (in dollars per share)	$ 0.039	$ 0.005
Earnings per share-diluted available to common shareholders (in dollars per share)	$ 0.032	$ 0.004