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Note 7 - Intangible Assets (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Intangible Assets and Goodwill [Table Text Block]
   
June 30, 2019
   
December 31, 2018
 
   
 
 
 
 
Accumulated
   
 
 
 
 
 
 
 
 
Accumulated
   
 
 
 
   
Cost
   
Amortization
   
Balance
   
Cost
   
Amortization
   
Balance
 
                                                 
Customer relationships
  $
32,841,900
    $
(13,458,753
)   $
19,383,147
    $
32,638,900
    $
(8,326,564
)   $
24,312,336
 
Permits, licenses, and lease acquisition costs
   
9,621,521
     
(989,964
)    
8,631,557
     
9,599,621
     
(559,285
)    
9,040,336
 
Site location
   
849,347
     
(108,295
)    
741,052
     
849,347
     
(80,216
)    
769,131
 
Noncompetition agreements
   
616,000
     
(206,727
)    
409,273
     
614,000
     
(145,517
)    
468,483
 
Trade names and trademarks
   
722,200
     
(232,417
)    
489,783
     
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
   
1,810,463
     
-
     
1,810,463
     
1,088,413
     
-
     
1,088,413
 
                                                 
Total
  $
46,627,431
    $
(15,162,156
)   $
31,465,275
    $
46,525,481
    $
(9,492,947
)   $
37,032,534
 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
   
June 30,
   
 
 
 
 
 
 
 
   
2020
   
2021
   
2022
   
2023
   
2024
   
Thereafter
   
Total
 
                                                         
Customer relationships
  $
9,589,975
    $
8,460,912
    $
1,332,260
    $
-
    $
-
    $
-
    $
19,383,147
 
Permits, licenses, and lease acquisition costs
   
869,732
     
869,732
     
869,732
     
869,732
     
869,732
     
4,282,897
     
8,631,557
 
Site location
   
56,623
     
56,623
     
56,623
     
56,623
     
56,623
     
457,937
     
741,052
 
Noncompetition agreements
   
122,675
     
106,700
     
94,200
     
74,365
     
11,333
     
-
     
409,273
 
Trade names and trademarks
   
67,933
     
64,900
     
64,900
     
64,900
     
64,900
     
162,250
     
489,783
 
                                                         
Total
  $
10,706,938
    $
9,558,867
    $
2,417,715
    $
1,065,620
    $
1,002,588
    $
4,903,084
    $
29,654,812
 
Customer relationships
   
21
 
Permits, licenses, and lease acquisition costs
   
119
 
Site location
   
157
 
Noncompetition agreements
   
40
 
Trade names and trademarks
   
58