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Note 7 - Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Schedule of Intangible Assets and Goodwill [Table Text Block] |
|  | June 30, 2020 |  |  | December 31, 2019 |
|  |  |  |  |  | Accumulated |  |  |  |  |  |  |  |  |  |  | Accumulated |  |  |  |  |
|  | Cost |  |  | Amortization |  |  | Balance |  |  | Cost |  |  | Amortization |  |  | Balance |
Customer relationships |  | $ | 39,032,900 |  |  | $ | (19,237,453 | ) |  | $ | 19,795,447 |  |  | $ | 37,743,900 |  |  | $ | (17,890,487 | ) |  | $ | 19,853,413 |
Permits, licenses, and lease acquisition costs |  |  | 10,698,009 |  |  |  | (1,920,156 | ) |  |  | 8,777,853 |  |  |  | 10,305,521 |  |  |  | (1,443,337 | ) |  |  | 8,862,184 |
Site location |  |  | 849,347 |  |  |  | (164,996 | ) |  |  | 684,351 |  |  |  | 849,347 |  |  |  | (136,839 | ) |  |  | 712,508 |
Noncompetition agreements |  |  | 626,000 |  |  |  | (330,564 | ) |  |  | 295,436 |  |  |  | 626,000 |  |  |  | (269,318 | ) |  |  | 356,682 |
Trade names and trademarks |  |  | 1,692,200 |  |  |  | (312,387 | ) |  |  | 1,379,813 |  |  |  | 722,200 |  |  |  | (267,900 | ) |  |  | 454,300 |
Technology |  |  | 1,128,000 |  |  |  | (162,570 | ) |  |  | 965,430 |  |  |  | 138,000 |  |  |  | (138,000 | ) |  |  | - |
Nonsolicitation agreement |  |  | 28,000 |  |  |  | (28,000 | ) |  |  | - |  |  |  | 28,000 |  |  |  | (28,000 | ) |  |  | - |
Easements |  |  | 3,878,154 |  |  |  | - |  |  |  | 3,878,154 |  |  |  | 2,032,494 |  |  |  | - |  |  |  | 2,032,494 |
Total |  | $ | 57,932,610 |  |  | $ | (22,156,126 | ) |  | $ | 35,776,484 |  |  | $ | 52,445,462 |  |  | $ | (20,173,881 | ) |  | $ | 32,271,581 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
|  | June 30, |  |  |  |  |  |  |  |  |
|  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | 2025 |  |  | Thereafter |  |  | Total |
Customer relationships |  | $ | 2,500,221 |  |  | $ | 2,379,935 |  |  | $ | 2,379,935 |  |  | $ | 2,379,935 |  |  | $ | 2,379,935 |  |  | $ | 7,775,486 |  |  | $ | 19,795,447 |
Permits, licenses, and lease acquisition costs |  |  | 984,381 |  |  |  | 984,381 |  |  |  | 984,381 |  |  |  | 984,381 |  |  |  | 983,602 |  |  |  | 3,856,727 |  |  |  | 8,777,853 |
Site location |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 56,623 |  |  |  | 401,236 |  |  |  | 684,351 |
Noncompetition agreements |  |  | 109,323 |  |  |  | 96,200 |  |  |  | 76,442 |  |  |  | 13,248 |  |  |  | 223 |  |  |  | - |  |  |  | 295,436 |
Technology |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 99,000 |  |  |  | 470,430 |  |  |  | 965,430 |
Trade names and trademarks |  |  | 113,400 |  |  |  | 113,400 |  |  |  | 113,400 |  |  |  | 113,400 |  |  |  | 113,400 |  |  |  | 812,813 |  |  |  | 1,379,813 |
Total |  | $ | 3,862,948 |  |  | $ | 3,729,539 |  |  | $ | 3,709,781 |  |  | $ | 3,646,587 |  |  | $ | 3,632,783 |  |  | $ | 13,316,692 |  |  | $ | 31,898,330 |
Customer relationships |  |  | 85 |
Permits, licenses, and lease acquisition costs |  |  | 108 |
Site location |  |  | 145 |
Noncompetition agreements |  |  | 28 |
Technology |  |  | 117 |
Trade names and trademarks |  |  | 110 |

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