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Note 7 - Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accumulated amortization | $ (4,905,055) | $ (3,456,290)
Balance | 7,118,013 |
Total, cost | 12,509,918 | 12,805,913
Intangible assets, net | 7,604,863 | 9,349,623
Easements [Member] |  |
Accumulated amortization |  |
Balance | 486,850 | 466,360
Customer Relationships [Member] |  |
Cost | 7,818,900 | 8,132,900
Accumulated amortization | (4,232,685) | (2,970,533)
Balance | 3,586,215 | 5,162,367
Permits, Licenses and Lease Acquisition Costs [Member] |  |
Cost | 2,181,621 | 2,184,106
Accumulated amortization | (239,472) | (178,835)
Balance | 1,942,149 | 2,005,271
Site Location [Member] |  |
Cost | 849,347 | 849,347
Accumulated amortization | (51,904) | (23,593)
Balance | 797,443 | 825,754
Noncompete Agreements [Member] |  |
Cost | 285,000 | 285,000
Accumulated amortization | (94,917) | (66,417)
Balance | 190,083 | 218,583
Trademarks and Trade Names [Member] |  |
Cost | 722,200 | 722,200
Accumulated amortization | (158,417) | (112,250)
Balance | 563,783 | 609,950
Technology-Based Intangible Assets [Member] |  |
Cost | 138,000 | 138,000
Accumulated amortization | (99,660) | (76,662)
Balance | 38,340 | 61,338
Nonsolicitation Agreement [Member] |  |
Cost | 28,000 | 28,000
Accumulated amortization | (28,000) | (28,000)
Balance |  |

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