Note 7 - Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	January 2023			March 2023			July 2023
Conversion price before	$	6.30		$	2.87		$	2.65
Conversion price after	$	2.87		$	2.65		$	1.07
Term (years)		0.09			0.78			0.42
Volatility		167	%		168.9	%		156.8	%
Dividend rate		0	%		0	%		0	%
Risk free rate		4.46	%		4.20	%		4.22	%

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	2023		2022
Common stock equivalents of convertible promissory notes and accrued interest		7,448,487		969,173
Warrants		1,238,869		14,518
Stock options		6,218		6,380
Total		8,693,574		990,071

Schedule of Warrant Activity [Table Text Block]

	Number of Shares			Weighted-Average Exercise Price Per Share		Weighted- Average Remaining Contract Term
Balance at December 31, 2022		340,689		$	19.40		1.90
Warrants granted		1,071,429
Warrants expired		(14,518	)
Pre-funded warrants granted		946,429
Pre-funded warrants exercised		(946,429	)
Warrants exercised		(158,731	)
Exercisable and Outstanding at September 30, 2023		1,238,869		$	3.14		4.82

Warrants [Member]

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	March 2023
Conversion price before	$	6.30
Conversion price after	$	2.65
Term (years)		4.9
Volatility		123	%
Dividend rate		0	%
Risk free rate		4.20	%