Note I - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

	Warrant shares outstanding			Weighted Average exercise price		Weighted Average remaining life		Intrinsic value
Outstanding at January 1, 2019		1,592,775			2.55		0.21
Issued		1,749,171			0.50		4.10		1,556,762
Exercised		(675,000	)						532,413
Expired or cancelled		(1,592,775	)		2.55		-		-
Outstanding and exercisable at December 31,2019		1,074,171			0.50		4.10		956,012
Issued		6,459,000			2.01		3.00	$	-
Exercised		(1,163,775	)		0.85		-		-
Expired or cancelled					-		-		-
Outstanding and exercisable at December 31, 2020		6,369,396			1.97		2.48	$	2,784,117

Deferred Compensation Arrangement with Individual, Share-based Payments [Table Text Block]

	December 31, 2020			December 31, 2019
Shares-to-be-issued, outstanding January 1, 2020 and 2019, respectively		2,375,760			2,470,566
Granted in current period		642,667			2,103,793
Issued in current period		(590,098	)		(2,198,599	)
Shares-to be issued outstanding December 31, 2020 and 2019, respectively		2,428,329			2,375,760

Schedule of Warrant or Right Outstanding and Options, Valuation Assumptions [Table Text Block]

	2016 Warrants			2019 Warrants			Employee Stock Options
Fair Value of Common Stock	$	0.36-$.83		$	0.33		$	1.07 – 1.60
Expected Term		.2-.5 years			4.9 years			1.1 – 2.22 years
Volatility		86% - 100	%		83	%		91.8 – 102.3	%
Dividend yield		0.00	%		0.00	%		0.00	%
Exercise Price	$	2.55		$	0.50		$	1.04 – 2.09
Risk-free interest rate		1.88% - 2.09	%		2.30	%		1.68 – 1.53	%
Weighted average fair value of securities granted	$	-		$	0.22		$	0.72
Number of shares underlying securities granted		1,592,775			1,749,171			592,358

	2016 Warrants			2019 Warrants			Employee Stock Options
Fair Value of Common Stock	$	1.28		$	1.28		$	1.28
Expected Term		0.1 years			4.1 years			1- 2.1  years
Volatility		38	%		88	%		92 - 102	%
Dividend yield		0.00	%		0.00	%		0.00	%
Exercise Price	$	2.55		$	0.50		$	1.04 – 2.09
Risk-free interest rate		1.56	%		1.71	%		1.53 – 1.63	%
Weighted average fair value of warrants granted	$	-		$	1.01		$	0.64
Number of shares underlying warrants granted		1,592,775			1,084,171			592,358

Schedule Of Warrant Or Right Exercised Valuation Assumptions [Table Text Block]

	2019 Warrants
Fair Value of Common Stock	$	0.83 – 1.42
Expected Term		4.2 -4.3 years
Volatility		86 - 87	%
Dividend yield		0.00	%
Exercise Price	$	0.50
Risk-free interest rate		1.38 – 1.73	%
Weighted average fair value of warrants exercised	$	0.98
Number of shares underlying warrants exercised		665,000