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Note 4 - Acquisition - Unaudited Pro Forma Results of Operations (Details) - Genasys Acquisition [Member] - USD ($) | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Net Revenues | $ 27,255,960 | $ 22,381,779
Net Loss | $ (3,428,191) | $ (969,195)
Basic and diluted loss per share (in dollars per share) | $ (0.11) | $ (0.03)

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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