Condensed Consolidated Unaudited Statements of Cash Flows - USD ($)	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 1,818,990	$ 1,534,947
Adjustments to reconcile net income from operations to net cash flows from operating activities:
Depreciation	1,020,783	923,903
Amortization	48,125	132,499
Gain on sale of property and equipment	(300)	(21,624)
Equity-based compensation	642,785	765,554
Deferred income taxes	(423,322)	318,682
Provision (recovery) for losses on doubtful accounts	(77,000)	29,000
Inventory allowance	(231,625)	72,197
Other	1,978	1,308
Changes in assets and liabilities:
Accounts receivable	1,521,705	2,266,241
Inventories	(2,951,171)	2,625,416
Prepaid and other current assets	1,216,336	778,364
Other assets	(19,903)	(52,854)
Accounts payable	126,012	(771,163)
Accrued expenses and accrued wages, salaries and bonuses	(1,059,839)	(822,955)
Income taxes payable	(368,469)	(117,476)
Net cash flows from operating activities	1,265,085	7,662,039
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(1,366,767)	(837,895)
Proceeds from sales of property and equipment	300	31,978
Net cash flows from investing activities	(1,366,467)	(805,917)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under revolving credit facility	623,945,799	610,559,577
Repayments under revolving credit facility	(622,433,675)	(615,994,225)
Principal payments on long-term debt	(185,753)	(180,267)
Repurchase of common stock	(644,528)	(1,038,060)
Dividends on common stock	(458,859)	(452,685)
Withholdings on the exercise of equity-based awards	(79,850)	(107,082)
Net cash flows from financing activities	143,134	(7,212,742)
Net change in cash	41,752	(356,620)
Cash, beginning of period	523,065	605,380
Cash, end of period	564,817	248,760
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	489,840	365,620
Cash paid during the period for income taxes	705,790	1,133,794
Supplemental disclosure of non-cash information:
Equipment acquisitions classified in accounts payable	63,962	29,219
Issuance of common stock in connection with the vesting and exercise of equity-based awards	$ 1,183,091	$ 1,262,763