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Note 4 - Acquisitions - Unaudited Pro Forma Results of Operations (Details) - Genasys Acquisition [Member] - USD ($) | 3 Months Ended | 6 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Net revenues | $ 8,042,879 | $ 6,034,248 | $ 16,222,894 | $ 9,474,427
Net income | $ 529,094 | $ 276,048 | $ (1,081,478) | $ (788,438)
Basic and diluted earnings per share (in dollars per share) | $ 0.02 | $ 0.01 | $ (0.03) | $ (0.02)

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