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Note 17 - Segment Information - Segment Disclosures (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018
Revenues | $ 10,191,691 | $ 7,868,448 | $ 20,369,250 | $ 15,497,015 |
Operating Income | 1,435,386 | 604,154 | 2,725,261 | 1,595,260 |
Depreciation and amortization | (216,370) | (133,704) | (417,637) | (193,809) |
Interest expense |  | (9,815) |  | (9,815) |
Income tax expense | (274,144) | (158,451) | (557,147) | (2,867,339) |
Long-lived assets | 6,204,451 |  | 6,204,451 |  | $ 6,452,061
Total assets | 40,736,317 |  | 40,736,317 |  | 41,860,797
Intersegment Eliminations [Member] |  |  |  |  |
Revenues | 279,997 | 89,818 | 466,969 | 89,818 |
LRAD Segment [Member] |  |  |  |  |
Revenues | 9,646,513 | 7,453,794 | 19,303,215 | 15,082,361 |
Operating Income | 1,282,308 | 579,498 | 2,584,954 | 1,570,604 |
Depreciation and amortization | (138,665) | (64,660) | (262,966) | (124,765) |
Interest expense |  |  |  |  |
Income tax expense | (274,144) | (158,451) | (557,147) | (2,867,339) |
Long-lived assets | 2,508,027 |  | 2,508,027 |  | 2,478,144
Total assets | 35,948,659 |  | 35,948,659 |  | 36,770,872
LRAD Segment [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Revenues |  |  |  |  |
Genasys Segment [Member] |  |  |  |  |
Revenues | 545,178 | 414,654 | 1,066,035 | 414,654 |
Operating Income | 153,078 | 24,656 | 140,307 | 24,656 |
Depreciation and amortization | (77,705) | (69,044) | (154,671) | (69,044) |
Interest expense |  | (9,815) |  | (9,815) |
Income tax expense |  |  |  |  |
Long-lived assets | 3,696,424 |  | 3,696,424 |  | 3,973,917
Total assets | 4,787,658 |  | 4,787,658 |  | $ 5,089,925
Genasys Segment [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Revenues | $ 279,997 | $ 89,818 | $ 466,969 | $ 89,818 |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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