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Note 4 - Acquisitions - Unaudited Pro Forma Results of Operations (Details) - Genasys Acquisition [Member] - USD ($) | 3 Months Ended | 9 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Net revenues | $ 7,610,260 | $ 4,646,765 | $ 23,833,153 | $ 14,326,125
Net loss | $ (48,821) | $ (473,480) | $ (1,136,331) | $ (1,257,072)
Basic and diluted loss per share (in dollars per share) | $ 0 | $ (0.01) | $ (0.04) | $ (0.04)

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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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