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Note 7 - Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Intangible Assets and Goodwill [Table Text Block] |
|  | September 30, 2020 |  |  | December 31, 2019 |
|  |  |  |  |  | Accumulated |  |  |  |  |  |  |  |  |  |  | Accumulated |  |  |  |  |
|  | Cost |  |  | Amortization |  |  | Balance |  |  | Cost |  |  | Amortization |  |  | Balance |
Customer relationships |  | $ | 39,321,524 |  |  | $ | (19,926,167 | ) |  | $ | 19,395,357 |  |  | $ | 37,743,900 |  |  | $ | (17,890,487 | ) |  | $ | 19,853,413 |
Permits, licenses, and lease acquisition costs |  |  | 10,720,023 |  |  |  | (2,166,042 | ) |  |  | 8,553,981 |  |  |  | 10,305,521 |  |  |  | (1,443,337 | ) |  |  | 8,862,184 |
Site location |  |  | 849,347 |  |  |  | (179,229 | ) |  |  | 670,118 |  |  |  | 849,347 |  |  |  | (136,839 | ) |  |  | 712,508 |
Noncompetition agreements |  |  | 626,000 |  |  |  | (358,981 | ) |  |  | 267,019 |  |  |  | 626,000 |  |  |  | (269,318 | ) |  |  | 356,682 |
Technology |  |  | 1,128,000 |  |  |  | (187,410 | ) |  |  | 940,590 |  |  |  | 138,000 |  |  |  | (138,000 | ) |  |  | - |
Trade names and trademarks |  |  | 1,692,200 |  |  |  | (340,693 | ) |  |  | 1,351,507 |  |  |  | 722,200 |  |  |  | (267,900 | ) |  |  | 454,300 |
Nonsolicitation agreement |  |  | 28,000 |  |  |  | (28,000 | ) |  |  | - |  |  |  | 28,000 |  |  |  | (28,000 | ) |  |  | - |
Easements |  |  | 4,240,002 |  |  |  | - |  |  |  | 4,240,002 |  |  |  | 2,032,494 |  |  |  | - |  |  |  | 2,032,494 |
Total |  | $ | 58,605,096 |  |  | $ | (23,186,522 | ) |  | $ | 35,418,574 |  |  | $ | 52,445,462 |  |  | $ | (20,173,881 | ) |  | $ | 32,271,581 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
|  | September 30, |  |  |  |  |  |  |  |  |
|  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | 2025 |  |  | Thereafter |  |  | Total |
Customer relationships |  | $ | 2,439,725 |  |  | $ | 2,408,935 |  |  | $ | 2,408,935 |  |  | $ | 2,408,935 |  |  | $ | 2,408,935 |  |  | $ | 7,319,892 |  |  | $ | 19,395,357 |
Permits, licenses, and lease acquisition costs |  |  | 986,582 |  |  |  | 986,582 |  |  |  | 986,582 |  |  |  | 986,582 |  |  |  | 979,913 |  |  |  | 3,627,740 |  |  |  | 8,553,981 |
Site location |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 387,003 |  |  |  | 670,118 |
Noncompetition agreements |  |  | 104,971 |  |  |  | 95,206 |  |  |  | 64,839 |  |  |  | 2,003 |  |  |  | - |  |  |  | - |  |  |  | 267,019 |
Technology |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 445,590 |  |  |  | 940,590 |
Trade names and trademarks |  |  | 113,400 |  |  |  | 113,400 |  |  |  | 113,400 |  |  |  | 113,400 |  |  |  | 113,400 |  |  |  | 784,507 |  |  |  | 1,351,507 |
Total |  | $ | 3,800,301 |  |  | $ | 3,759,746 |  |  | $ | 3,729,379 |  |  | $ | 3,666,543 |  |  | $ | 3,657,871 |  |  | $ | 12,564,732 |  |  | $ | 31,178,572 |
Customer relationships |  |  | 84 |
Permits, licenses, and lease acquisition costs |  |  | 105 |
Site location |  |  | 142 |
Noncompetition agreements |  |  | 29 |
Technology |  |  | 114 |
Trade names and trademarks |  |  | 143 |

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