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Note 16 - Segment Information - Segment Disclosures (Details) - USD ($)	3 Months Ended		6 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2017
Revenues	$ 7,514,068	$ 4,129,554	$ 23,011,082	$ 12,813,280	$ 23,011,082	$ 12,813,280
Operating Income	(178,127)	(996,571)	1,417,132	(1,890,345)	1,417,132
Depreciation and amortization	(143,469)				(337,200)
Interest expense	(4,388)				(14,205)
Income tax expense (benefit)	(73,749)	$ (435,726)	2,793,590	$ (752,969)	2,793,590	$ (752,969)
Long-lived assets	4,606,602		4,606,602		4,606,602		$ 565,292
Total assets	40,642,934		40,642,934		40,642,934		38,857,800
Intersegment Eliminations [Member]
Revenues	96,192				186,010
LRAD Segment [Member]
Revenues	7,012,430				22,094,790
Operating Income	(63,257)				1,507,264
Depreciation and amortization	(62,665)				(187,433)
Interest expense
Income tax expense (benefit)	(73,749)				2,793,590
Long-lived assets	538,173		538,173		538,173		565,292
Total assets	35,520,401		35,520,401		35,520,401		38,857,800
LRAD Segment [Member] | Intersegment Eliminations [Member]
Revenues
Genasys Segment [Member]
Revenues	501,638				916,292
Operating Income	(114,870)				(90,132)
Depreciation and amortization	(80,804)				(149,767)
Interest expense	(4,388)				(14,205)
Income tax expense (benefit)
Long-lived assets	4,068,429		4,068,429		4,068,429
Total assets	5,122,533		$ 5,122,533		5,122,533
Genasys Segment [Member] | Intersegment Eliminations [Member]
Revenues	$ 96,192				$ 186,010

X

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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