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Note 7 - Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Intangible Assets and Goodwill [Table Text Block] |
|  | December 31, 2020 |  |  | December 31, 2019 |
|  |  |  |  |  | Accumulated |  |  |  |  |  |  |  |  |  |  | Accumulated |  |  |  |  |
|  | Cost |  |  | Amortization |  |  | Balance |  |  | Cost |  |  | Amortization |  |  | Balance |
Customer relationships |  | $ | 46,740,483 |  |  | $ | (20,558,751 | ) |  | $ | 26,181,732 |  |  | $ | 37,743,900 |  |  | $ | (17,890,487 | ) |  | $ | 19,853,413 |
Permits, licenses, and lease acquisition costs |  |  | 11,053,673 |  |  |  | (2,412,313 | ) |  |  | 8,641,360 |  |  |  | 10,305,521 |  |  |  | (1,443,337 | ) |  |  | 8,862,184 |
Site location |  |  | 849,347 |  |  |  | (193,462 | ) |  |  | 655,885 |  |  |  | 849,347 |  |  |  | (136,839 | ) |  |  | 712,508 |
Noncompetition agreements |  |  | 626,000 |  |  |  | (386,934 | ) |  |  | 239,066 |  |  |  | 626,000 |  |  |  | (269,318 | ) |  |  | 356,682 |
Technology |  |  | 1,128,000 |  |  |  | (212,250 | ) |  |  | 915,750 |  |  |  | 138,000 |  |  |  | (138,000 | ) |  |  | - |
Trade names and trademarks |  |  | 3,602,202 |  |  |  | (369,175 | ) |  |  | 3,233,027 |  |  |  | 722,200 |  |  |  | (267,900 | ) |  |  | 454,300 |
Nonsolicitation agreement |  |  | 28,000 |  |  |  | (28,000 | ) |  |  | - |  |  |  | 28,000 |  |  |  | (28,000 | ) |  |  | - |
Easements |  |  | 4,507,089 |  |  |  | - |  |  |  | 4,507,089 |  |  |  | 2,032,494 |  |  |  | - |  |  |  | 2,032,494 |
Total |  | $ | 68,534,794 |  |  | $ | (24,160,885 | ) |  | $ | 44,373,909 |  |  | $ | 52,445,462 |  |  | $ | (20,173,881 | ) |  | $ | 32,271,581 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
|  | December 31, |  |  |  |  |  |  |  |  |
|  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | 2025 |  |  | Thereafter |  |  | Total |
Customer relationships |  | $ | 3,132,966 |  |  | $ | 3,132,966 |  |  | $ | 3,132,966 |  |  | $ | 3,132,966 |  |  | $ | 3,132,966 |  |  | $ | 10,516,902 |  |  | $ | 26,181,732 |
Permits, licenses and lease acquisition costs |  |  | 1,012,947 |  |  |  | 1,012,947 |  |  |  | 1,012,947 |  |  |  | 1,012,947 |  |  |  | 999,939 |  |  |  | 3,589,633 |  |  |  | 8,641,360 |
Site location |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 372,770 |  |  |  | 655,885 |
Noncompetition agreements |  |  | 101,200 |  |  |  | 90,366 |  |  |  | 46,100 |  |  |  | 1,400 |  |  |  | - |  |  |  | - |  |  |  | 239,066 |
Technology |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 420,750 |  |  |  | 915,750 |
Trade names and trademarks |  |  | 208,900 |  |  |  | 208,900 |  |  |  | 208,900 |  |  |  | 208,900 |  |  |  | 208,900 |  |  |  | 2,188,527 |  |  |  | 3,233,027 |
Total |  | $ | 4,611,636 |  |  | $ | 4,600,802 |  |  | $ | 4,556,536 |  |  | $ | 4,511,836 |  |  | $ | 4,497,428 |  |  | $ | 17,088,582 |  |  | $ | 39,866,820 |
Customer relationships |  |  | 100 |
Permits, licenses, and lease acquisition costs |  |  | 102 |
Site location |  |  | 139 |
Noncompetition agreements |  |  | 26 |
Technology |  |  | 111 |
Trade names and trademarks |  |  | 186 |

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