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Note 2 - Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2018
Minimum [Member]
Property and equipment, useful life (Year)	2 years
Maximum [Member]
Property and equipment, useful life (Year)	15 years
Structures [Member]
Property and equipment, useful life (Year)	15 years
Digital Displays and Electrical [Member] | Minimum [Member]
Property and equipment, useful life (Year)	3 years
Digital Displays and Electrical [Member] | Maximum [Member]
Property and equipment, useful life (Year)	10 years
Static and Tri-vision Displays [Member] | Minimum [Member]
Property and equipment, useful life (Year)	7 years
Static and Tri-vision Displays [Member] | Maximum [Member]
Property and equipment, useful life (Year)	15 years
Vehicles, Equipment and Furniture [Member] | Minimum [Member]
Property and equipment, useful life (Year)	2 years
Vehicles, Equipment and Furniture [Member] | Maximum [Member]
Property and equipment, useful life (Year)	5 years

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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

X

- Details

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X

- Details

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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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