Note 7 - Patents

3 Months Ended

Mar. 31, 2021

Notes to Financial Statements

Goodwill and Intangible Assets Disclosure [Text Block]

NOTE

7

 — PATENTS

    

	March 31, 2021
	Cost		Accumulated Amortization			Net
Patents-foundation intellectual property	$	1,377,863	$	(1,059,966	)	$	317,897
Total	$	1,377,863	$	(1,059,966	)	$	317,897

	December 31, 2020
	Cost		Accumulated Amortization			Net
Patents-foundation intellectual property	$	1,377,863	$	(1,048,614	)	$	329,249
Total	$	1,377,863	$	(1,048,614	)	$	329,249

Patents are amortized utilizing the straight-line method over estimated useful lives ranging from

3

to

20

years. Amortization expense was approximately

$11,000

 and

$13,000

for the

three

months ended

March 31, 2021

and

March 31, 2020,

respectively.