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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities:
Net loss	$ (1,302,564)	$ (1,042,492)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	337,200	93,859
Warranty provision	12,361
Inventory obsolescence	91,976	(186,772)
Share-based compensation	433,063	943,923
Deferred income taxes	2,793,590	(754,569)
Changes in operating assets and liabilities:
Accounts receivable, net	(496,642)	1,024,797
Inventories, net	(239,360)	(760,351)
Prepaid expenses and other	153,576	(22,923)
Other assets	(60,615)	180,063
Accounts payable	376,864	1,223,342
Accrued liabilities	54,610	291,725
Net cash provided by operating activities	2,154,059	990,602
Investing Activities:
Purchases of marketable securities	(3,208,197)	(2,304,263)
Proceeds from maturities of marketable securities	3,335,639	2,402,861
Capital expenditures	(166,845)	(171,735)
Purchase of Genasys, net of cash and restricted cash acquired	(2,246,545)
Patent costs paid		(7,789)
Net cash used in investing activities	(2,285,948)	(80,926)
Financing Activities:
Proceeds from exercise of stock options	1,027,719
Repurchase of common stock	(500,272)
Proceeds from the issuance of promissory notes	63,144
Payments on promissory notes	(786,437)
Net cash used in financing activities	(195,846)
Effect of foreign exchange rate on cash	(1,594)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(329,329)	909,676
Cash, cash equivalents and restricted cash, beginning of period	12,803,887	13,466,711
Cash, cash equivalents and restricted cash, end of period	12,474,558	14,376,387
Reconciliation of cash, cash equivalents and restricted cash to the condensed consolidated balance sheets:
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows	12,803,887	13,466,711
Interest paid	12,235
Noncash investing and financing activities:
Change in unrealized loss on marketable securities	(11,064)	(1,978)
Business combinations accounted for as a purchase:
Fair value of assets acquired	5,520,504
Cash paid	(3,011,439)
Liabilities assumed	$ 2,509,065

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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Amount of cash outflow for purchase of marketable security.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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