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Note 7 - Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Intangible Assets and Goodwill [Table Text Block]
   
March 31, 2020
   
December 31, 2019
 
     
 
 
 
Accumulated
     
 
 
   
 
 
 
Accumulated
     
 
 
   
Cost
   
Amortization
   
Balance
   
Cost
   
Amortization
   
Balance
 
                                                 
Customer relationships
  $
39,855,900
    $
(18,547,994
)   $
21,307,906
    $
37,743,900
    $
(17,890,487
)   $
19,853,413
 
Permits, licenses, and lease acquisition costs
   
10,613,471
     
(1,675,972
)    
8,937,499
     
10,305,521
     
(1,443,337
)    
8,862,184
 
Site location
   
849,347
     
(150,995
)    
698,352
     
849,347
     
(136,839
)    
712,508
 
Noncompetition agreements
   
626,000
     
(300,618
)    
325,382
     
626,000
     
(269,318
)    
356,682
 
Trade names and trademarks
   
1,692,200
     
(284,125
)    
1,408,075
     
722,200
     
(267,900
)    
454,300
 
Technology
   
138,000
     
(138,000
)    
-
     
138,000
     
(138,000
)    
-
 
Nonsolicitation agreement
   
28,000
     
(28,000
)    
-
     
28,000
     
(28,000
)    
-
 
Easements
   
2,697,880
     
-
     
2,697,880
     
2,032,494
     
-
     
2,032,494
 
                                                 
Total
  $
56,500,798
    $
(21,125,704
)   $
35,375,094
    $
52,445,462
    $
(20,173,881
)   $
32,271,581
 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
   
March 31,
     
 
 
   
 
 
   
2021
   
2022
   
2023
   
2024
   
2025
   
Thereafter
   
Total
 
                                                         
Customer relationships
  $
2,683,287
    $
2,462,235
    $
2,462,235
    $
2,462,235
    $
2,462,235
    $
8,775,679
    $
21,307,906
 
Permits, licenses, and lease acquisition costs
   
975,927
     
975,927
     
975,927
     
975,927
     
975,927
     
4,057,864
     
8,937,499
 
Site location
   
56,623
     
56,623
     
56,623
     
56,623
     
56,623
     
415,237
     
698,352
 
Noncompetition agreements
   
114,117
     
97,450
     
83,365
     
29,617
     
833
     
-
     
325,382
 
Trade names and trademarks
   
161,900
     
161,900
     
161,900
     
161,900
     
161,900
     
598,575
     
1,408,075
 
                                                         
Total
  $
3,991,854
    $
3,754,135
    $
3,740,050
    $
3,686,302
    $
3,657,518
    $
13,847,355
    $
32,677,214
 
Customer relationships
   
89
 
Permits, licenses, and lease acquisition costs
   
111
 
Site location
   
148
 
Noncompetition agreements
   
31
 
Trade names and trademarks
   
85