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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating Activities:    
Net income (loss) $ 2,862,831 $ (1,302,564)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 623,317 337,200
Warranty provision 62,689 12,361
Inventory obsolescence 121,035 91,976
Share-based compensation 563,386 433,063
Deferred income taxes 675,457 2,793,590
Changes in operating assets and liabilities:    
Accounts receivable, net (4,029,608) (496,642)
Inventories, net 200,306 (239,360)
Prepaid expenses and other 2,330,897 153,576
Other assets 116,973 (60,615)
Accounts payable (2,267,016) 376,864
Payroll and related (583,162) (81,631)
Warranty settlements (30,287) (42,602)
Accrued and other liabilities 1,766,516 178,843
Net cash provided by operating activities 2,413,334 2,154,059
Investing Activities:    
Purchases of marketable securities (3,290,667) (3,208,197)
Proceeds from maturities of marketable securities 3,624,338 3,335,639
Capital expenditures (303,912) (166,845)
Purchase of Genasys, net of cash and restricted cash acquired (2,246,545)
Net cash provided by (used in) investing activities 29,759 (2,285,948)
Financing Activities:    
Proceeds from exercise of stock options 54,621 1,027,719
Repurchase of common stock (2,171,022) (500,272)
Proceeds from the issuance of unsecured promissory notes 63,144
Payments on promissory notes (17,044) (786,437)
Net cash used in financing activities (2,133,445) (195,846)
Effect of foreign exchange rate on cash (21,443) (1,594)
Net increase (decrease) in cash, cash equivalents, and restricted cash 288,205 (329,329)
Cash, cash equivalents and restricted cash, beginning of period 11,806,074 12,803,887
Cash, cash equivalents and restricted cash, end of period 12,094,279 12,474,558
Total cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows 11,806,074 12,803,887
Supplemental disclosures of cash flow information:    
Interest paid 2,860 12,235
Noncash investing and financing activities:    
Change in unrealized gain (loss) on marketable securities 19,102 (11,064)
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