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Note 4 - Acquisitions - Unaudited Pro Forma Results of Operations (Details) - Genasys Acquisition [Member] - USD ($)
3 Months Ended 6 Months Ended
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)