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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 |  |  |

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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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