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Note 7 - Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2019
Notes Tables |
Schedule of Intangible Assets and Goodwill [Table Text Block] |
|  | September 30, 2019 |  |  | December 31, 2018 |
|  |  |  |  |  | Accumulated |  |  |  |  |  |  |  |  |  |  | Accumulated |  |  |  |  |
|  | Cost |  |  | Amortization |  |  | Balance |  |  | Cost |  |  | Amortization |  |  | Balance |
Customer relationships |  | $ | 37,534,900 |  |  | $ | (16,870,061 | ) |  | $ | 20,664,839 |  |  | $ | 32,638,900 |  |  | $ | (8,326,564 | ) |  | $ | 24,312,336 |
Permits, licenses, and lease acquisition costs |  |  | 10,216,521 |  |  |  | (1,207,276 | ) |  |  | 9,009,245 |  |  |  | 9,599,621 |  |  |  | (559,285 | ) |  |  | 9,040,336 |
Site location |  |  | 849,347 |  |  |  | (122,567 | ) |  |  | 726,780 |  |  |  | 849,347 |  |  |  | (80,216 | ) |  |  | 769,131 |
Noncompetition agreements |  |  | 626,000 |  |  |  | (237,862 | ) |  |  | 388,138 |  |  |  | 614,000 |  |  |  | (145,517 | ) |  |  | 468,483 |
Trade names and trademarks |  |  | 722,200 |  |  |  | (250,917 | ) |  |  | 471,283 |  |  |  | 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 |  |  | 1,836,495 |  |  |  | - |  |  |  | 1,836,495 |  |  |  | 1,088,413 |  |  |  | - |  |  |  | 1,088,413 |
Total |  | $ | 51,951,463 |  |  | $ | (18,854,683 | ) |  | $ | 33,096,780 |  |  | $ | 46,525,481 |  |  | $ | (9,492,947 | ) |  | $ | 37,032,534 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
|  | September 30, |  |  |  |  |  |  |  |  |
|  | 2020 |  |  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | Thereafter |  |  | Total |
Customer relationships |  | $ | 10,065,957 |  |  | $ | 8,951,436 |  |  | $ | 1,647,446 |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 20,664,839 |
Permits, licenses, and lease acquisition costs |  |  | 936,232 |  |  |  | 936,232 |  |  |  | 936,232 |  |  |  | 936,232 |  |  |  | 936,232 |  |  |  | 4,328,085 |  |  |  | 9,009,245 |
Site location |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 443,665 |  |  |  | 726,780 |
Noncompetition agreements |  |  | 121,145 |  |  |  | 104,950 |  |  |  | 95,200 |  |  |  | 64,851 |  |  |  | 1,992 |  |  |  | - |  |  |  | 388,138 |
Trade names and trademarks |  |  | 65,658 |  |  |  | 64,900 |  |  |  | 64,900 |  |  |  | 64,900 |  |  |  | 64,900 |  |  |  | 146,025 |  |  |  | 471,283 |
Total |  | $ | 11,245,615 |  |  | $ | 10,114,141 |  |  | $ | 2,800,401 |  |  | $ | 1,122,606 |  |  | $ | 1,059,747 |  |  | $ | 4,917,775 |  |  | $ | 31,260,285 |
Customer relationships |  |  | 20 |
Permits, licenses, and lease acquisition costs |  |  | 116 |
Site location |  |  | 154 |
Noncompetition agreements |  |  | 37 |
Trade names and trademarks |  |  | 56 |

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