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Note 16 - Segment Information - Segment Disclosures (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017
Revenues | $ 7,868,448 | $ 5,742,391 | $ 15,497,015 | $ 8,683,726 |
Operating Income | 604,154 | 435,561 | 1,595,260 | (893,774) |
Depreciation and amortization | (133,704) |  | (193,809) |  |
Interest expense | (9,815) |  | (9,815) |  |
Income tax expense | (158,451) | $ (169,285) | (2,867,339) | $ 317,243 |
Long-lived assets | 4,921,001 |  | 4,921,001 |  | $ 565,292
Total assets | 40,889,487 |  | 40,889,487 |  | 38,857,800
Intersegment Eliminations [Member] |  |  |  |  |
Revenues | 89,818 |  | 89,818 |  |
LRAD Segment [Member] |  |  |  |  |
Revenues | 7,453,794 |  | 15,082,361 |  |
Operating Income | 579,498 |  | 1,570,604 |  |
Depreciation and amortization | (64,660) |  | (124,765) |  |
Interest expense |  |  |  |  |
Income tax expense | (158,451) |  | (2,867,339) |  |
Long-lived assets | 527,872 |  | 527,872 |  | 565,292
Total assets | 35,471,343 |  | 35,471,343 |  | 38,857,800
LRAD Segment [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Revenues |  |  |  |  |
Genasys Segment [Member] |  |  |  |  |
Revenues | 414,654 |  | 414,654 |  |
Operating Income | 24,656 |  | 24,656 |  |
Depreciation and amortization | (69,044) |  | (69,044) |  |
Interest expense | (9,815) |  | (9,815) |  |
Income tax expense |  |  |  |  |
Long-lived assets | 4,393,129 |  | 4,393,129 |  |
Total assets | 5,418,144 |  | 5,418,144 |  |
Genasys Segment [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Revenues | $ 89,818 |  | $ 89,818 |  |

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