Note 7 - Derivatives (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

Schedule of Derivative Liabilities at Fair Value [Table Text Block]

Derivative liability balance at December 31, 2019	$	50,989
Derivative instrument recognized for A, B and Agent Warrants		2,669,995
Derivative instrument related to Promissory Note 2020		120,921
Gain recognized to revalue derivative instrument at fair value		(27,107	)
Derivative liability balance at March 30, 2020	$	2,814,798
Derivative instrument recognized for May 2020 Warrants		1,324,184
Derivative instrument recognized for June 2020 Warrants		1,749,721
Derivative instrument related to Promissory Note 2020		20,542
Reclassification of Warrant liabilities to Equity on exercise		(1,701,756	)
Loss recognized to revalue derivative instrument at fair value		422,081
Derivative liability balance at June 30, 2020	$	4,629,570
Derivative liability balance at December 31, 2020	$	294,382
Gain recognized to revalue derivative instrument at fair value		(95,671	)
Derivative liability balance at March 31, 2021	$	198,711
Loss recognized to revalue derivative instrument at fair value		30,909
Derivative liability balance at June 30, 2021	$	229,620