CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 15,545,265	$ 5,542,590
Adjustments to reconcile net income from operations to net cash flows from (used in) operating activities:
Depreciation	3,093,017	3,116,449
Equity method investment earnings, net of tax	(3,357,978)	(183,579)
Impairment charges		485,270
(Gain) loss on sales of property and equipment	(9,864)	105,039
Equity-based compensation	2,415,156	1,085,287
Deferred income taxes	(275,347)	(16,798)
Provision for losses on doubtful accounts	50,000	(21,000)
Inventory allowance	37,708	(322,240)
Changes in assets and liabilities:
Accounts receivable	(1,615,734)	(9,591,809)
Inventories	3,721,980	3,693,984
Prepaid and other current assets	(2,732,480)	4,794,469
Equity method investment distributions	1,392,730
Other assets	48,967	(110,207)
Accounts payable	1,998,494	3,529,980
Accrued expenses and accrued wages, salaries and bonuses	1,164,828	1,353,113
Other long-term liabilities	(169,854)	885,230
Income taxes payable and receivable	(371,248)	857,270
Net cash flows from (used in) operating activities	20,935,640	15,203,048
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(1,525,882)	(3,356,573)
Proceeds from sales of property and equipment	55,728	43,600
Investment in equity method investee		(6,500,000)
Issuance of note receivable		(3,500,000)
Net cash flows from (used in) investing activities	(1,470,154)	(13,312,973)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under revolving credit facility	1,663,751,276	1,515,476,055
Repayments under revolving credit facility	(1,682,072,093)	(1,513,881,087)
Proceeds from borrowings on long-term debt	3,000,000
Principal payments on long-term debt	(510,177)	(532,747)
Proceeds from exercise of stock options		25,750
Repurchase of common stock	(5,738)	(2,029,694)
Dividends on common stock	(3,355,301)	(594,653)
Settlement and withholdings of equity-based awards	(415,057)	(30,208)
Net cash flows from (used in) financing activities	(19,607,090)	(1,566,584)
Net change in cash	(141,604)	323,491
Cash, beginning of period	661,195	337,704
Cash, end of period	519,591	661,195
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	1,353,985	1,743,098
Cash paid during the period for income taxes	5,138,454	1,302,528
Supplemental disclosure of non-cash information:
Equipment acquisitions classified in accounts payable	128,249
Issuance of common stock in connection with the vesting and exercise of equity-based awards	$ 949,812	$ 990,653