Note 9 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

Schedule of Preferred Stock [Table Text Block]

	March 31, 2020				December 31, 2019
			Carrying				Carrying
	Shares		Value		Shares		Value
Series B Convertible Preferred Stock		100	$	76,095		100	$	76,095
Series H Convertible Preferred Stock		-		-		1,686		1,156,338
Series I Convertible Preferred Stock		-		-		700		700,000
Series J Convertible Preferred Stock		300		300,000		-		-
Total		400	$	376,095		2,486	$	1,932,433

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

	Expiration Date	Exercise Price		Number of Warrants
Series G	September 2021	$	25,440		48
Series H	December 2021		1.15		217,392
Series I	Aug-Dec 2024		15,000		48