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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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- Definition

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- 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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-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
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