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Note 12 - Commitments and Contingencies (Details Textual) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 EUR (€) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jan. 18, 2018 USD ($) | Jan. 18, 2018 EUR (€)
Target Bonus Amounts of Percentage of Employee Base Salary, Minimum | 25.00% | 25.00% |  | 25.00% |  |  |
Target Bonus Amounts of Percentage of Employee Base Salary Maximum | 75.00% | 75.00% |  | 75.00% |  |  |
Payment of Bonus as Percentage, Level 1 |  |  |  | 87.00% |  |  |
Payment of Bonus as Percentage, Level 2 |  |  |  | 100.00% |  |  |
Payment of Bonus as Percentage, Level 3 |  |  |  | 135.00% |  |  |
Genasys [Member] |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Current |  |  |  |  |  | $ 185,250 | € 150,000
Payment for Contingent Consideration Liability, Investing Activities | $ 179,265 | € 150,000 |  |  |  |  |
Bonuses and Related Payroll Tax Expense [Member] |  |  |  |  |  |  |
Increase (Decrease) in Other Employee-Related Liabilities | $ 475,000 |  | $ 366,820 | $ 1,213,543 | $ 745,900 |  |

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