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Note 7 - Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Intangible Assets and Goodwill [Table Text Block] |
|  | December 31, 2019 |  |  | December 31, 2018 |
|  |  |  |  |  | Accumulated |  |  |  |  |  |  |  |  |  |  | Accumulated |  |  |  |  |
|  | Cost |  |  | Amortization |  |  | Balance |  |  | Cost |  |  | Amortization |  |  | Balance |
Customer relationships |  | $ | 37,743,900 |  |  | $ | (17,890,487 | ) |  | $ | 19,853,413 |  |  | $ | 32,638,900 |  |  | $ | (8,326,564 | ) |  | $ | 24,312,336 |
Permits, licenses, and lease acquisition costs |  |  | 10,305,521 |  |  |  | (1,443,337 | ) |  |  | 8,862,184 |  |  |  | 9,599,621 |  |  |  | (559,285 | ) |  |  | 9,040,336 |
Site location |  |  | 849,347 |  |  |  | (136,839 | ) |  |  | 712,508 |  |  |  | 849,347 |  |  |  | (80,216 | ) |  |  | 769,131 |
Noncompetition agreements |  |  | 626,000 |  |  |  | (269,318 | ) |  |  | 356,682 |  |  |  | 614,000 |  |  |  | (145,517 | ) |  |  | 468,483 |
Trade names and trademarks |  |  | 722,200 |  |  |  | (267,900 | ) |  |  | 454,300 |  |  |  | 722,200 |  |  |  | (195,417 | ) |  |  | 526,783 |
Technology |  |  | 138,000 |  |  |  | (138,000 | ) |  |  | - |  |  |  | 138,000 |  |  |  | (122,657 | ) |  |  | 15,343 |
Nonsolicitation agreement |  |  | 28,000 |  |  |  | (28,000 | ) |  |  | - |  |  |  | 28,000 |  |  |  | (28,000 | ) |  |  | - |
Favorable leases |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 847,000 |  |  |  | (35,291 | ) |  |  | 811,709 |
Easements |  |  | 2,032,494 |  |  |  | - |  |  |  | 2,032,494 |  |  |  | 1,088,413 |  |  |  | - |  |  |  | 1,088,413 |
Total |  | $ | 52,445,462 |  |  | $ | (20,173,881 | ) |  | $ | 32,271,581 |  |  | $ | 46,525,481 |  |  | $ | (9,492,947 | ) |  | $ | 37,032,534 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
|  | December 31, |  |  |  |  |  |  |  |  |
|  | 2020 |  |  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | Thereafter |  |  | Total |
Customer relationships |  | $ | 2,573,841 |  |  | $ | 2,251,035 |  |  | $ | 2,251,035 |  |  | $ | 2,251,035 |  |  | $ | 2,251,035 |  |  | $ | 8,275,432 |  |  | $ | 19,853,413 |
Permits, licenses and lease acquisition costs |  |  | 945,132 |  |  |  | 945,132 |  |  |  | 945,132 |  |  |  | 945,132 |  |  |  | 945,132 |  |  |  | 4,136,524 |  |  |  | 8,862,184 |
Site location |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 429,393 |  |  |  | 712,508 |
Noncompetition agreements |  |  | 117,617 |  |  |  | 101,200 |  |  |  | 90,365 |  |  |  | 46,100 |  |  |  | 1,400 |  |  |  | - |  |  |  | 356,682 |
Trade names and trademarks |  |  | 64,900 |  |  |  | 64,900 |  |  |  | 64,900 |  |  |  | 64,900 |  |  |  | 64,900 |  |  |  | 129,800 |  |  |  | 454,300 |
Total |  | $ | 3,758,113 |  |  | $ | 3,418,890 |  |  | $ | 3,408,055 |  |  | $ | 3,363,790 |  |  | $ | 3,319,090 |  |  | $ | 12,971,149 |  |  | $ | 30,239,087 |
Customer relationships |  |  | 90 |
Permits, licenses, and lease acquisition costs |  |  | 113 |
Site location |  |  | 151 |
Noncompetition agreements |  |  | 34 |
Trade names and trademarks |  |  | 54 |

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