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Note 7 - Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2021
Notes Tables |
Schedule of Intangible Assets and Goodwill [Table Text Block] |
|  | March 31, 2021 |  |  | December 31, 2020 |
|  |  |  |  |  | Accumulated |  |  |  |  |  |  |  |  |  |  | Accumulated |  |  |  |  |
|  | Cost |  |  | Amortization |  |  | Balance |  |  | Cost |  |  | Amortization |  |  | Balance |
Customer relationships |  | $ | 48,087,482 |  |  | $ | (21,353,075 | ) |  | $ | 26,734,407 |  |  | $ | 46,740,483 |  |  | $ | (20,558,751 | ) |  | $ | 26,181,732 |
Permits, licenses, and lease acquisition costs |  |  | 11,257,673 |  |  |  | (2,665,384 | ) |  |  | 8,592,289 |  |  |  | 11,053,673 |  |  |  | (2,412,313 | ) |  |  | 8,641,360 |
Site location |  |  | 849,347 |  |  |  | (207,426 | ) |  |  | 641,921 |  |  |  | 849,347 |  |  |  | (193,462 | ) |  |  | 655,885 |
Noncompetition agreements |  |  | 626,000 |  |  |  | (414,405 | ) |  |  | 211,595 |  |  |  | 626,000 |  |  |  | (386,934 | ) |  |  | 239,066 |
Trade names and trademarks |  |  | 3,602,202 |  |  |  | (421,107 | ) |  |  | 3,181,095 |  |  |  | 3,602,202 |  |  |  | (369,175 | ) |  |  | 3,233,027 |
Technology |  |  | 1,128,000 |  |  |  | (236,661 | ) |  |  | 891,339 |  |  |  | 1,128,000 |  |  |  | (212,250 | ) |  |  | 915,750 |
Nonsolicitation agreement |  |  | 28,000 |  |  |  | (28,000 | ) |  |  | - |  |  |  | 28,000 |  |  |  | (28,000 | ) |  |  | - |
Easements |  |  | 4,507,089 |  |  |  | - |  |  |  | 4,507,089 |  |  |  | 4,507,089 |  |  |  | - |  |  |  | 4,507,089 |
Total |  | $ | 70,085,793 |  |  | $ | (25,326,058 | ) |  | $ | 44,759,735 |  |  | $ | 68,534,794 |  |  | $ | (24,160,885 | ) |  | $ | 44,373,909 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
|  | March 31, |  |  |  |  |  |  |  |  |
|  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | 2025 |  |  | Thereafter |  |  | Total |
Customer relationships |  | $ | 3,267,666 |  |  | $ | 3,267,666 |  |  | $ | 3,267,666 |  |  | $ | 3,267,666 |  |  | $ | 3,267,666 |  |  | $ | 10,396,077 |  |  | $ | 26,734,407 |
Permits, licenses, and lease acquisition costs |  |  | 1,033,348 |  |  |  | 1,033,348 |  |  |  | 1,033,348 |  |  |  | 1,033,348 |  |  |  | 1,013,202 |  |  |  | 3,445,695 |  |  |  | 8,592,289 |
Site location |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 358,806 |  |  |  | 641,921 |
Noncompetition agreements |  |  | 97,450 |  |  |  | 83,462 |  |  |  | 29,843 |  |  |  | 840 |  |  |  | - |  |  |  | - |  |  |  | 211,595 |
Trade names and trademarks |  |  | 208,900 |  |  |  | 208,900 |  |  |  | 208,900 |  |  |  | 208,900 |  |  |  | 208,900 |  |  |  | 2,136,595 |  |  |  | 3,181,095 |
Technology |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 396,339 |  |  |  | 891,339 |
Total |  | $ | 4,762,987 |  |  | $ | 4,748,999 |  |  | $ | 4,695,380 |  |  | $ | 4,666,377 |  |  | $ | 4,645,391 |  |  | $ | 16,733,512 |  |  | $ | 40,252,646 |
Customer relationships |  |  | 98 |
Permits, licenses, and lease acquisition costs |  |  | 100 |
Site location |  |  | 136 |
Noncompetition agreements |  |  | 23 |
Trade names and trademarks |  |  | 183 |
Technology |  |  | 108 |

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