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Note 7 - Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accumulated amortization | $ (12,305,583) | $ (9,492,947)
Balance | 32,511,385 |
Total, cost | 46,004,381 | 46,525,481
Intangible assets, net | 33,698,798 | 37,032,534
Easements [Member] |  |
Accumulated amortization |  |
Balance | 1,187,413 | 1,088,413
Customer Relationships [Member] |  |
Cost | 32,841,900 | 32,638,900
Accumulated amortization | (10,885,769) | (8,326,564)
Balance | 21,956,131 | 24,312,336
Permits, Licenses and Lease Acquisition Costs [Member] |  |
Cost | 9,621,521 | 9,599,621
Accumulated amortization | (773,576) | (559,285)
Balance | 8,847,945 | 9,040,336
Site Location [Member] |  |
Cost | 849,347 | 849,347
Accumulated amortization | (94,178) | (80,216)
Balance | 755,169 | 769,131
Noncompete Agreements [Member] |  |
Cost | 616,000 | 614,000
Accumulated amortization | (175,987) | (145,517)
Balance | 440,013 | 468,483
Trademarks and Trade Names [Member] |  |
Cost | 722,200 | 722,200
Accumulated amortization | (213,917) | (195,417)
Balance | 508,283 | 526,783
Technology-Based Intangible Assets [Member] |  |
Cost | 138,000 | 138,000
Accumulated amortization | (134,156) | (122,657)
Balance | 3,844 | 15,343
Nonsolicitation Agreement [Member] |  |
Cost | 28,000 | 28,000
Accumulated amortization | (28,000) | (28,000)
Balance |  |
Off-Market Favorable Lease [Member] |  |
Cost |  | 847,000
Accumulated amortization |  | (35,291)
Balance |  | $ 811,709

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