Note 1 - Summary of Significant Accounting Policies - Segments (Details) - USD ($)	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Revenue	$ 255,241	$ 411,593
Segment Loss	(3,293,184)	(1,760,022)
Segment Loss	3,293,184	$ 1,760,022
Domestic [Member]
Revenue	219,660
Segment Loss	(887,831)
Segment Loss	887,831
International [Member]
Revenue	35,581
Segment Loss	(84,569)
Segment Loss	84,569
Domestic and International Segments [Member]
Segment Loss	(972,400)
Segment Loss	972,400
Corporate Segment [Member]
Segment Loss	(2,320,784)
Segment Loss	$ 2,320,784

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration