Note 8 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 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, 2020		1,074,171		$	0.50	$	4.10		956,012
Issued		-			-		-		-
Exercised		(460,725	)		0.50		-		630,389
Expired or cancelled		-			-		-		-
Outstanding and exercisable at March 31, 2020		613,446		$	0.50	$	3.85		-
Exercisable at March 31, 2020		613,446		$	0.50	$	3.85		460,085

	Warrant shares outstanding		Weighted Average exercise price		Weighted Average remaining life		Intrinsic value
Outstanding at January 1, 2019		1,500,000	$	2.55	$	0.97		-
Issued		1,749,171	$	0.50	$	4.85		-
Exercised		-	$	-	$	-		-
Expired or cancelled		-	$	-	$	-		-
Outstanding and exercisable at March 31, 2019		3,249,171	$	1.45	$	2.94		-
Exercisable at March 31, 2019		3,249,171	$	1.45	$	2.94		-

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

	March 31, 2020			March 31, 2019
Shares-to-be-issued, outstanding January 1, 2020 and 2019, respectively		2,375,7603			2,470,565
Granted in current period		102,768			337,145
Issued in current period		(11,995	)		-
Shares-to be issued outstanding March 31, 2020 and 2019, respectively		2,466,5339			2,807,710

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

	Warrants
Expected Term (years)	5 years
Volatility		85	%
Dividend yield		0.00	%
Exercise Price	$	0.50
Risk-free interest rate		2.50	%
Weighted average fair value of warrants granted	$	0.22
Number of shares underlying warrants granted		1,749,171

	Warrants
Expected Term (years)		4.9
Volatility		85	%
Dividend yield		0.00	%
Exercise Price	$	0.50
Risk-free interest rate		2.23	%
Weighted average fair value of warrants granted	$	0.19