Note 7 - Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

	2020			2019
Lighting patent	$	6,797,000		$	6,797,000
Accumulated amortization		(1,840,853	)		(1,416,041	)
Net	$	4,956,147		$	5,380,959