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Note 4 - Acquisition - Preliminary Acquisition Consideration (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 18, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Cash paid at closing |  | $ 2,431,795 |
Assets Acquired |  |  |
Goodwill, Ending Balance |  | $ 2,445,990 |
Genasys Acquisition [Member] |  |  |
Cash paid at closing | $ 2,826,189 |  |
Acquisition escrow liability | 185,250 |  |
Total consideration | 3,011,439 |  |
Assets Acquired |  |  |
Cash and restricted cash acquired | 579,644 |  |
Accounts receivable | 426,940 |  |
Fixed assets | 5,712 |  |
Intangible assets | 1,850,000 |  |
Goodwill, Ending Balance | 2,603,688 |  |
Other assets | 54,520 |  |
Total assets acquired | 5,520,504 |  |
Liabilities assumed |  |  |
Accounts payable | 275,653 |  |
Accrued expenses and other liabilities | 315,817 |  |
Severance obligation | 397,558 |  |
Debt | 1,520,037 |  |
Total liabilities assumed | 2,509,065 |  |
Net assets acquired | $ 3,011,439 |  |

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