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Note 7 - Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accumulated amortization | $ (6,513,762) | $ (3,456,290)
Balance | 39,501,306 |
Total, cost | 46,956,481 | 12,805,913
Intangible assets, net | 40,442,719 | 9,349,623
Easements [Member] |  |
Accumulated amortization |  |
Balance | 941,413 | 466,360
Customer Relationships [Member] |  |
Cost | 32,638,900 | 8,132,900
Accumulated amortization | (5,652,893) | (2,970,533)
Balance | 26,986,007 | 5,162,367
Permits, Licenses and Lease Acquisition Costs [Member] |  |
Cost | 9,599,621 | 2,184,106
Accumulated amortization | (340,166) | (178,835)
Balance | 9,259,455 | 2,005,271
Site Location [Member] |  |
Cost | 849,347 | 849,347
Accumulated amortization | (66,060) | (23,593)
Balance | 783,287 | 825,754
Noncompete Agreements [Member] |  |
Cost | 614,000 | 285,000
Accumulated amortization | (114,817) | (66,417)
Balance | 499,183 | 218,583
Trademarks and Trade Names [Member] |  |
Cost | 722,200 | 722,200
Accumulated amortization | (176,917) | (112,250)
Balance | 545,283 | 609,950
Technology-Based Intangible Assets [Member] |  |
Cost | 138,000 | 138,000
Accumulated amortization | (111,159) | (76,662)
Balance | 26,841 | 61,338
Nonsolicitation Agreement [Member] |  |
Cost | 28,000 | 28,000
Accumulated amortization | (28,000) | (28,000)
Balance |  |
Off-Market Favorable Lease [Member] |  |
Cost | 1,425,000 |
Accumulated amortization | (23,750) |
Balance | $ 1,401,250 |

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