CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net income	$ 3,850,073	$ 9,097,255
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	5,568,929	4,661,789
Paycheck Protection Program loan forgiveness	0	(9,839,100)
Gain on sale of equipment	(755,470)	(681,653)
Provision for deferred taxes	2,421,646	211,677
Provision for loss on contract	248,770	0
Amortization of intangible assets	444,565	230,588
Amortization of operating lease right-of-use assets	98,711	0
Accreted interest on operating lease right-of-use assets	11,802	0
Accreted interest on notes payable	49,638	0
Operating lease payments	(117,558)	0
Increase in contracts receivable	(17,432,706)	(2,845,528)
(Increase) decrease in retainage receivable	(3,526,153)	1,566,283
Decrease (increase) in other receivables	532,462	(533,870)
Increase in contract assets	(7,379,191)	(2,184,539)
Decrease (increase) in prepaid expenses and other	2,948,003	(202,057)
Increase in accounts payable	13,029,016	2,063,170
Increase in accrued expenses and other current liabilities	5,417,842	953,534
Increase (decrease) increase in contract liabilities	2,874,288	(1,698,610)
Net cash provided by operating activities	8,284,667	798,939
Cash flows from investing activities:
Acquisition of Revolt Energy	0	(150,000)
Acquisition of West Virginia Pipeline, net of cash received of $250,000	0	(3,250,000)
Investment in property and equipment	(5,308,189)	(6,047,693)
Acquisition of Ryan Environmental and Ryan Transport	(4,042,057)	0
Proceeds from sales of property and equipment	1,071,723	758,391
Net cash used in investing activities	(8,278,523)	(8,689,302)
Cash flows from financing activities:
Preferred stock redemption	(1,210,525)	0
Preferred dividends paid	0	(309,000)
Borrowings on lines of credit and short-term debt, net of repayments	4,687,099	8,030,407
Principal payments on long-term debt	(4,281,983)	(2,821,125)
Net cash (used in) provided by financing activities	(805,409)	4,900,282
Decrease in cash and cash equivalents	(799,265)	(2,990,081)
Cash and cash equivalents beginning of period	8,226,739	11,216,820
Cash and cash equivalents end of period	7,427,474	8,226,739
Supplemental schedule of noncash investing and financing activities:
Purchases of property & equipment under financing agreements	549,455	3,349,139
Prepaid insurance premiums financed	3,352,971	3,213,402
Note payable to finance West Virginia Pipeline acquisition	0	3,000,000
Note payable to refinance short-term borrowing	0	2,850,000
Accrued dividends on preferred stock	0	52,488
Debt assumed in acquisitions for equipment	390,445	205,829
Sellers' note Tri-State Paving acquisition	936,000	0
Note payable to finance Tri-State Paving acquisition	7,500,000	0
Common stock issued to finance Tri-State Paving acquisition	1,048,218	0
Par value of common stock issued from preferred stock coversion	263	0
Operating lease right-of-use assets	1,710,032	0
Cash paid during the year for:
Interest	846,129	557,320
Income taxes	$ 50,231	$ 251,996