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Note 17 - Segment Information - Segment Disclosures (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Revenue from Contract with Customer, Including Assessed Tax | $ 36,979,055 | $ 26,306,790
Operating Income | 3,136,365 | (1,476,465)
Depreciation and amortization | 824,889 | 483,087
Interest expense |  | 20,949
Income tax expense | 572,200 | 2,375,600
Long-lived assets | 5,750,890 | 6,452,061
Total assets | 47,119,983 | 41,860,797
Intersegment Eliminations [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 907,785 | 313,110
LRAD Segment [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 34,931,448 | 24,836,795
Operating Income | 3,097,498 | (1,387,902)
Depreciation and amortization | 517,081 | 254,618
Interest expense |  |
Income tax expense | 572,200 | 2,375,000
Long-lived assets | 2,283,344 | 2,478,144
Total assets | 42,470,356 | 36,770,872
LRAD Segment [Member] | Intersegment Eliminations [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax |  |
Genasys Segment [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 2,047,607 | 1,469,995
Operating Income | 38,867 | (88,563)
Depreciation and amortization | 307,808 | 228,469
Interest expense |  | 20,949
Income tax expense |  |
Long-lived assets | 3,467,546 | 3,973,917
Total assets | 4,649,627 | 5,089,925
Genasys Segment [Member] | Intersegment Eliminations [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 907,785 | $ 313,110

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