Note 5 - Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2019

Notes Tables

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	September 30, 2019
	Cost Basis		Unrealized Gain		Fair Value		Cash Equivalents		Short-term Securities		Long-term Securities
Level 1:
Money market funds	$	275,538	$	-	$	275,538	$	275,538	$	-	$	-
Level 2:
Certificates of deposit		971,592		-		971,592		-		499,000		472,592
Municipal securities		240,463		205		240,668		-		80,336		160,332
Corporate bonds		3,856,766		11,157		3,867,923		-		3,116,028		751,895
Subtotal		5,068,821		11,362		5,080,183		-		3,695,364		1,384,819
Total	$	5,344,359	$	11,362	$	5,355,721	$	275,538	$	3,695,364	$	1,384,819

	September 30, 2018
	Cost Basis		Unrealized Gain			Fair Value		Cash Equivalents		Short-term Securities		Long-term Securities
Level 1:
Money market funds	$	410,393	$	-		$	410,393	$	410,393	$	-	$	-
Level 2:
Certificates of deposit		499,000		-			499,000		-		-		499,000
Corporate bonds		4,302,661		(8,945	)		4,293,716		-		3,592,175		701,541
Subtotal		4,801,661		(8,945	)		4,792,716		-		3,592,175		1,200,541
Total	$	5,212,054	$	(8,945	)	$	5,203,109	$	410,393	$	3,592,175	$	1,200,541

Fair Value Measurements, Nonrecurring [Table Text Block]

	Fair Value Measurements at September 30, 2019
	Carrying Value		Active Markets for Identifiable Assets (Level 1)		Observable Inputs (Level 2)		Unobservable Inputs (Level 3)		Non-Cash Impairment Loss
Intangible assets from Genasys acquisition	$	1,142,814	$	-	$	-	$	1,142,814	$	-
Goodwill	$	2,305,750	$	-	$	-	$	2,305,750	$	-
Patents	$	32,820	$	-	$	-	$	32,820	$	-

	Fair Value Measurements at September 30, 2018
	Carrying Value		Active Markets for Identifiable Assets (Level 1)		Observable Inputs (Level 2)		Unobservable Inputs (Level 3)		Non-Cash Impairment Loss
Intangible assets from Genasys acquisition (a)	$	1,520,006	$	-	$	-	$	1,520,006	$	-
Goodwill from Genasys acquisition (b)	$	2,445,990	$	-	$	-	$	2,445,990	$	-
Patents (c)	$	37,340	$	-	$	-	$	37,340	$	(11,133	)