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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Property, Plant and Equipment, Useful Life [Table Text Block] |
|  | Years |
Structures |  |  | 15 |
Digital displays and electrical |  |  | 3 to 10 |
Static and tri-vision displays |  |  | 7 to 15 |
Vehicles, equipment, and furniture |  |  | 2 to 5 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | Years |
Customer relationships |  |  | 3 to 10 |
Permits, licenses, and lease acquisition costs |  |  | 10 to 50 |
Noncompetition and nonsolicitation agreements |  |  | 2 to 5 |
Technology, trade names, and trademarks |  |  | 2 to 3 |
Site location |  |  | 15 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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