Note 2 - Summary of Significant Accounting Policies - Estimated Useful Lives of Fixed Assets (Details)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Computer Equipment [Member]
Estimated useful life (Year)	3 years
Machinery and Equipment [Member] \| Minimum [Member]
Estimated useful life (Year)	5 years
Machinery and Equipment [Member] \| Maximum [Member]
Estimated useful life (Year)	7 years
Furniture and Fixtures [Member]
Estimated useful life (Year)	5 years
Leasehold Improvements [Member]
Estimated useful life (Year)	11 years 292 days	12 years 292 days
Useful life	Earlier of life of improvement or lease

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration