CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 3,614,610	$ 2,949,576
Adjustments to reconcile net income from operations to net cash flows from operating activities:
Depreciation	2,238,771	1,784,475
Amortization	79,375	265,000
Impairment charges	1,912,877
Gain on sale of property and equipment	(4,070)	(31,622)
Equity-based compensation	1,271,840	1,394,879
Deferred income taxes	(553,462)	(243,387)
Provision for losses on doubtful accounts	90,000	98,000
Inventory allowance	(291,917)	(101,716)
Other	3,955	3,285
Changes in assets and liabilities:
Accounts receivable	(828,442)	(755,299)
Inventories	(5,056,917)	(24,403,398)
Prepaid and other current assets	(633,032)	4,389,238
Other assets	8,695	(22,406)
Accounts payable	3,295,390	(467,348)
Accrued expenses and accrued wages, salaries and bonuses	1,563,964	669,873
Income taxes payable and receivable	(816,181)	709,028
Net cash flows from (used in) operating activities	5,895,456	(13,761,822)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(3,226,107)	(2,565,699)
Proceeds from sales of property and equipment	5,800	46,654
Net cash flows from (used in) investing activities	(3,220,307)	(2,519,045)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under revolving credit facility	1,424,929,646	1,311,967,154
Repayments under revolving credit facility	(1,418,538,231)	(1,293,467,198)
Principal payments on long-term debt	(541,844)	(362,495)
Repurchase of common stock	(7,723,450)	(1,124,921)
Dividends on common stock	(702,491)	(706,906)
Withholdings on the exercise of equity-based awards	(101,200)	(107,082)
Net cash flows from (used in) financing activities	(2,677,570)	16,198,552
Net change in cash	(2,421)	(82,315)
Cash, beginning of period	523,065	605,380
Cash, end of period	520,644	523,065
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	1,137,691	819,969
Cash paid during the period for income taxes	2,533,643	2,023,359
Supplemental disclosure of non-cash information:
Equipment acquisitions classified in accounts payable	1,253	101,361
Purchase of property financed with debt	1,575,000
Acquisition of assets financed with debt	699,717
Issuance of common stock in connection with the vesting and exercise of equity-based awards	$ 1,183,091	$ 1,262,763