CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 3,269,783	$ 1,850,296	$ (3,653,905)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	433,510	451,278	436,208
Share-based compensation expense:
Stock options	17,337
Stock awards	160,006	173,492	199,995
Excess and obsolete inventory cost	66,511	98,728
Deferred income taxes	38	57	61,852
(Increase) decrease in:
Accounts receivable	(2,020,574)	1,101,356	225,336
Contract asset	80,182	(80,182)	554,190
Inventories	112,848	(289,314)	(100,454)
Prepaid expenses and other current assets	(33,060)	(99,393)	288,899
Other non-current assets	(96,269)
Increase (decrease) in:
Accounts payable	(288,181)	(450,719)	208,541
Accrued expenses	207,568	(323,972)	(297,016)
Income taxes	(1,666)	3,341	258,931
Contract liability	284,134	(327,570)	76,447
Net cash provided by (used in) operating activities	2,192,167	2,107,398	(1,740,976)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(118,797)	(81,281)	(2,548,612)
Net cash (used in) investing activities	(118,797)	(81,281)	(2,548,612)
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	175,143
Tax withholding related to cashless exercise of stock options	(880,476)
Net cash (used in) financing activities	(705,333)
Net increase (decrease) in cash and cash equivalents and restricted cash	1,368,037	2,026,117	(4,289,588)
Cash and cash equivalents and restricted cash, beginning of year	22,416,830	20,390,713	24,680,301
Cash and cash equivalents and restricted cash, end of year	23,784,867	22,416,830	20,390,713
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for income taxes	2,456	456	8,456
Cash received from income tax refund	309,712	$ 2,049	265,588
SUPPLEMENTAL DISCLOSURE OF NONCASH INFORMATION
Transfer from unbilled to accounts receivable			$ 926,632
Cashless exercise of stock options	1,635,000
Accrual of dividends payable	$ 11,180,900

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