Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Operating Activities:
Net loss	$ (3,745,042)	$ (876,754)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	483,087	153,283
Provision for doubtful accounts	150,000
Warranty provision	6,093	(70,946)
Inventory obsolescence	171,535	26,243
Share-based compensation	584,873	1,116,400
Deferred income taxes	2,374,000	196,000
Gain on disposition of fixed asset	252
Loss on impairment of patents	11,133
Changes in operating assets and liabilities:
Accounts receivable, net	3,149,579	(2,272,970)
Inventories, net	(1,648,484)	(519,568)
Prepaid expenses and other	(2,075,323)	(147,456)
Other assets	(60,615)	226,937
Accounts payable	192,638	537,800
Payroll and related	127,623	1,487,734
Warranty settlements	(11,395)	(67,959)
Accrued and other liabilities	1,541,865	(455,516)
Net cash provided by (used in) operating activities	1,251,819	(666,772)
Investing Activities:
Purchases of marketable securities	(4,920,547)	(2,908,093)
Proceeds from maturities of marketable securities	5,190,821	2,961,367
Capital expenditures	(625,845)	(182,326)
Purchase of Genasys, net of cash and restricted cash acquired	(2,431,795)
Net cash used in investing activities	(2,787,366)	(129,052)
Financing Activities:
Proceeds from exercise of stock options	2,434,888	133,000
Repurchase of common stock	(725,445)
Proceeds from the issuance of unsecured promissory notes	62,656
Payments on promissory notes	(1,175,205)
Net cash provided by financing activities	596,894	133,000
Effect of foreign exchange rate on cash	(59,160)
Net decrease in cash, cash equivalents, and restricted cash	(997,813)	(662,824)
Cash, cash equivalents and restricted cash, beginning of period	12,803,887	13,466,711
Cash, cash equivalents and restricted cash, end of period	11,806,074	12,803,887
Reconciliation of cash, cash equivalents and restricted cash to the consolidated balance sheets:
Cash and cash equivalents	11,063,091	12,764,421
Restricted cash, current portion	403,427
Long-term restricted cash	339,556	39,466
Supplemental disclosures of cash flow information:
Interest paid	18,015
Noncash investing and financing activities:
Change in unrealized loss on marketable securities	(7,676)	280
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 reacquire common stock during the period.

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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 exercise of stock options granted under share-based compensation arrangement.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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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