Note 6 - Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	September 30, 2021		December 31, 2020
Lighting patent	$	6,797,000	$	6,797,000
Product technology		345,356		-
Customer relationships		219,772		-
Capitalized software development costs		53,215		-
Trade names		47,094		-
Total identifiable intangible assets		7,462,437		6,797,000
Less: Accumulated amortization		2,183,570		1,840,853
Net	$	5,278,867	$	4,956,147