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Note 7 - Stockholders' Equity - Warrants (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Warrants outstanding January 1, 2020 (in shares)				0
Prefunded warrants issued May 2020 (in shares)				515,000
Exercises and conversions (in shares)				0
Warrants outstanding June 30, 2020 (in shares)	515,000	515,000		515,000
Base value of warrants, 515,000 warrants at $5	$ 2,575,000
Fair value adjustment	236,900	$ 236,900	$ (0)	$ 236,900	$ (0)
Balance at June 30, 2020	$ 2,811,900	$ 2,811,900		$ 2,811,900