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Note 12 - Commitments and Contingencies (Details Textual) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 18, 2018 | Sep. 30, 2017
Target Bonus Amounts of Percentage of Employee Base Salary, Minimum | 25.00% |  |  |
Target Bonus Amounts of Percentage of Employee Base Salary Maximum | 75.00% |  |  |
Payment of Bonus as Percentage, Level 1 | 50.00% |  |  |
Payment of Bonus as Percentage, Level 2 | 100.00% |  |  |
Payment of Bonus as Percentage, Level 3 | 200.00% |  |  |
Business Combination, Contingent Consideration, Liability, Current | $ 185,250 |  |  |
Genasys [Member] |  |  |  |
Business Combination, Contingent Consideration, Liability, Current |  |  | $ 185,250 |
Bonuses and Related Payroll Tax Expense [Member] |  |  |  |
Increase (Decrease) in Other Employee-Related Liabilities | $ 738,543 | $ 379,080 |  |

X
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