CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 5,064,902	$ 3,269,783	$ 1,850,296
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	432,176	433,510	451,278
Share-based compensation expense
Stock options	181,350	17,337
Stock awards	159,980	160,006	173,492
Excess and obsolete inventory cost	(100,446)	66,511	98,728
Deferred income taxes	(1,193,511)	38	57
(Increase) decrease in:
Accounts receivable	322,774	(2,020,574)	1,101,356
Contract asset		80,182	(80,182)
Inventories	(153,611)	112,848	(289,314)
Prepaid expenses and other current assets	(157,967)	(33,060)	(99,393)
Other non-current assets		(96,269)
Increase (decrease) in:
Accounts payable	(167,272)	(288,181)	(450,719)
Accrued expenses	(4,655)	207,568	(323,972)
Income taxes	104,640	(1,666)	3,341
Contract liability	104,139	284,134	(327,570)
Net cash provided by operating activities	4,592,499	2,192,167	2,107,398
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(340,678)	(118,797)	(81,281)
Net cash (used in) investing activities	(340,678)	(118,797)	(81,281)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from paycheck protection program		1,203,900
Repayment of paycheck protection program		(1,203,900)
Proceeds from exercise of stock options	17,010	175,143
Tax withholding related to cashless exercise of stock options		(880,476)
Dividend paid	(19,788,092)
Net cash (used in) financing activities	(19,771,082)	(705,333)
Net (decrease) increase in cash and cash equivalents and restricted cash	(15,519,261)	1,368,037	2,026,117
Cash and cash equivalents and restricted cash, beginning of year	23,784,867	22,416,830	20,390,713
Cash and cash equivalents and restricted cash, end of year	8,265,606	23,784,867	22,416,830
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for income taxes	$ 1,089	2,456	456
Cash received from income tax refund		309,712	$ 2,049
SUPPLEMENTAL DISCLOSURE OF NONCASH INFORMATION
Cashless exercise of stock options		1,635,000
Accrual of dividends payable		$ 11,180,900

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