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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities:
Net (loss)	$ (1,222,344)	$ (514,329)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	193,809	62,834
Warranty provision	12,361	111,369
Inventory obsolescence	85,435	(181,486)
Share-based compensation	284,250	642,151
Deferred income taxes	2,867,339	(317,243)
Changes in operating assets and liabilities:
Accounts receivable, net	389,434	168,183
Inventories, net	(271,543)	(174,720)
Prepaid expenses and other	174,589	(101,304)
Other assets	(60,614)	133,188
Accounts payable	502,933	707,549
Accrued and other liabilities	(56,313)	521,375
Net cash provided by operating activities	2,899,336	1,057,567
Investing Activities:
Purchases of marketable securities	(2,402,346)	(1,773,530)
Proceeds from maturities of marketable securities	2,401,856	1,874,823
Capital expenditures	(90,135)	(57,473)
Patent costs paid		(4,286)
Purchase of Genasys, net of cash and restricted cash acquired	(2,246,545)
Net cash (used in) provided by investing activities	(2,337,170)	39,534
Financing Activities:
Proceeds from exercise of stock options	185,718
Proceeds from issuance of unsecured promissory notes	63,144
Payments on unsecured promissory notes	(414,477)
Net cash used in financing activities	(165,615)
Effect of foreign exchange rate on cash	335
Net increase in cash, cash equivalents and restricted cash	396,886	1,097,101
Cash, cash equivalents and restricted cash, beginning of period	12,803,887	13,466,711
Cash, cash equivalents and restricted cash, end of period	13,200,773	14,563,812
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
Supplemental disclosures of cash flow information:
Interest paid	9,186
Noncash investing and financing activities:
Change in unrealized loss on marketable securities	(16,868)	(1,978)
Business combinations accounted for as a purchase:
Fair value of assets acquired	5,520,504
Cash paid or payable	(3,011,439)
Liabilities assumed	$ 2,509,065

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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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