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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

- Definition

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+ References

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- Definition

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+ References

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X

- Definition

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+ References

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X

- Definition

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+ References

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- Definition

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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