Note 5 - Fair Value Measurements (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2023

Dec. 31, 2022

Notes Tables

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

	September 30, 2023
	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	809,997	$	-	$	-	$	809,997

	December 31, 2022
	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	58,242	$	-	$	-	$	58,242

	December 31, 2022
	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	58,242	$	-	$	-	$	58,242
Other liabilities:
Fair value of contingent consideration	$	-	$	-	$	-	$	-

	December 31, 2021
	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	1,600,663	$	-	$	-	$	1,660,663
Other liabilities:
Fair value of contingent consideration	$	-	$	-	$	930,000	$	930,000

Asset Acquisition, Contingent Consideration [Table Text Block]

Fair value of contingent consideration:
December 31, 2022	$	-
Additions		682,000
March 31, 2023		682,000
Additions		-
June 30, 2023		682,000
Settlements		(682,000	)
September 30, 2023	$	-