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Note 7 - Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2019
Notes Tables |
Schedule of Intangible Assets and Goodwill [Table Text Block] |
|  | March 31, 2019 |  |  | December 31, 2018 |
|  |  |  |  |  | Accumulated |  |  |  |  |  |  |  |  |  |  | Accumulated |  |  |  |  |
|  | Cost |  |  | Amortization |  |  | Balance |  |  | Cost |  |  | Amortization |  |  | Balance |
Customer relationships |  | $ | 32,841,900 |  |  | $ | (10,885,769 | ) |  | $ | 21,956,131 |  |  | $ | 32,638,900 |  |  | $ | (8,326,564 | ) |  | $ | 24,312,336 |
Permits, licenses, and lease acquisition costs |  |  | 9,621,521 |  |  |  | (773,576 | ) |  |  | 8,847,945 |  |  |  | 9,599,621 |  |  |  | (559,285 | ) |  |  | 9,040,336 |
Site location |  |  | 849,347 |  |  |  | (94,178 | ) |  |  | 755,169 |  |  |  | 849,347 |  |  |  | (80,216 | ) |  |  | 769,131 |
Noncompetition agreements |  |  | 616,000 |  |  |  | (175,987 | ) |  |  | 440,013 |  |  |  | 614,000 |  |  |  | (145,517 | ) |  |  | 468,483 |
Trade names and trademarks |  |  | 722,200 |  |  |  | (213,917 | ) |  |  | 508,283 |  |  |  | 722,200 |  |  |  | (195,417 | ) |  |  | 526,783 |
Technology |  |  | 138,000 |  |  |  | (134,156 | ) |  |  | 3,844 |  |  |  | 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 |  |  | 1,187,413 |  |  |  | - |  |  |  | 1,187,413 |  |  |  | 1,088,413 |  |  |  | - |  |  |  | 1,088,413 |
Total |  | $ | 46,004,381 |  |  | $ | (12,305,583 | ) |  | $ | 33,698,798 |  |  | $ | 46,525,481 |  |  | $ | (9,492,947 | ) |  | $ | 37,032,534 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
|  | March 31, |  |  |  |  |  |  |  |  |
|  | 2019 |  |  | 2020 |  |  | 2021 |  |  | 2022 |  |  | 2023 |  |  | Thereafter |  |  | Total |
Customer relationships |  | $ | 9,937,564 |  |  | $ | 8,606,874 |  |  | $ | 3,411,693 |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 21,956,131 |
Permits, licenses, and lease acquisition costs |  |  | 869,732 |  |  |  | 869,732 |  |  |  | 869,732 |  |  |  | 869,732 |  |  |  | 869,732 |  |  |  | 4,499,285 |  |  |  | 8,847,945 |
Site location |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 472,054 |  |  |  | 755,169 |
Noncompetition agreements |  |  | 123,200 |  |  |  | 112,165 |  |  |  | 95,450 |  |  |  | 81,365 |  |  |  | 27,833 |  |  |  | - |  |  |  | 440,013 |
Trade names and trademarks |  |  | 70,208 |  |  |  | 64,900 |  |  |  | 64,900 |  |  |  | 64,900 |  |  |  | 64,900 |  |  |  | 178,475 |  |  |  | 508,283 |
Technology |  |  | 3,844 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 3,844 |
Total |  | $ | 11,061,171 |  |  | $ | 9,710,294 |  |  | $ | 4,498,398 |  |  | $ | 1,072,620 |  |  | $ | 1,019,088 |  |  | $ | 5,149,814 |  |  | $ | 32,511,385 |
Customer relationships |  |  | 24 |
Permits, licenses, and lease acquisition costs |  |  | 122 |
Site location |  |  | 160 |
Noncompetition agreements |  |  | 43 |
Trade names and trademarks |  |  | 60 |
Technology |  |  | 1 |

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