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Note 4 - Acquisitions - Unaudited Pro Forma Results of Operations (Details) - Genasys Acquisition [Member] - USD ($)
3 Months Ended 9 Months Ended
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)