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Note 16 - Subsequent Events (Details Textual) - USD ($)				2 Months Ended		12 Months Ended
	May 15, 2018	Mar. 06, 2018	Jun. 22, 2017	Mar. 14, 2019	May 15, 2018	Dec. 31, 2018	Dec. 31, 2017
Payments to Acquire Property, Plant, and Equipment, Total						$ 3,120,951	$ 2,268,034
Proceeds from Issuance of Common Stock						$ 150,000,000	$ 52,467,336
Common Class A [Member]
Stock Issued During Period, Shares, New Issues	3,137,768	3,300,000	7,113,462
Proceeds from Issuance of Common Stock	$ 73,110,000	$ 76,890,000	$ 88,139,834		$ 150,000,000
Subsequent Event [Member] | Common Class A [Member]
Stock Issued During Period, Shares, New Issues				147,438
Proceeds from Issuance of Common Stock				$ 3,585,121
Subsequent Event [Member] | Billboard Structures [Member]
Payments to Acquire Property, Plant, and Equipment, Total				$ 597,050

X

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
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- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

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-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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