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Note 7 - Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accumulated amortization | $ (25,326,058) | $ (24,160,885)
Balance | 40,252,646 |
Total, cost | 70,085,793 | 68,534,794
Intangible assets, net | 44,759,735 | 44,373,909
Easements [Member] |  |
Accumulated amortization | 0 | 0
Balance | 4,507,089 | 4,507,089
Customer Relationships [Member] |  |
Cost | 48,087,482 | 46,740,483
Accumulated amortization | (21,353,075) | (20,558,751)
Balance | 26,734,407 | 26,181,732
Permits, Licenses and Lease Acquisition Costs [Member] |  |
Cost | 11,257,673 | 11,053,673
Accumulated amortization | (2,665,384) | (2,412,313)
Balance | 8,592,289 | 8,641,360
Site Location [Member] |  |
Cost | 849,347 | 849,347
Accumulated amortization | (207,426) | (193,462)
Balance | 641,921 | 655,885
Noncompete Agreements [Member] |  |
Cost | 626,000 | 626,000
Accumulated amortization | (414,405) | (386,934)
Balance | 211,595 | 239,066
Trademarks and Trade Names [Member] |  |
Cost | 3,602,202 | 3,602,202
Accumulated amortization | (421,107) | (369,175)
Balance | 3,181,095 | 3,233,027
Technology-Based Intangible Assets [Member] |  |
Cost | 1,128,000 | 1,128,000
Accumulated amortization | (236,661) | (212,250)
Balance | 891,339 | 915,750
Nonsolicitation Agreement [Member] |  |
Cost | 28,000 | 28,000
Accumulated amortization | (28,000) | (28,000)
Balance | $ 0 | $ 0

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