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Note 7 - Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Intangible Assets and Goodwill [Table Text Block]
   
September 30, 2019
   
December 31, 2018
 
     
 
 
 
Accumulated
     
 
 
   
 
 
 
Accumulated
     
 
 
   
Cost
   
Amortization
   
Balance
   
Cost
   
Amortization
   
Balance
 
                                                 
Customer relationships
  $
37,534,900
    $
(16,870,061
)   $
20,664,839
    $
32,638,900
    $
(8,326,564
)   $
24,312,336
 
Permits, licenses, and lease acquisition costs
   
10,216,521
     
(1,207,276
)    
9,009,245
     
9,599,621
     
(559,285
)    
9,040,336
 
Site location
   
849,347
     
(122,567
)    
726,780
     
849,347
     
(80,216
)    
769,131
 
Noncompetition agreements
   
626,000
     
(237,862
)    
388,138
     
614,000
     
(145,517
)    
468,483
 
Trade names and trademarks
   
722,200
     
(250,917
)    
471,283
     
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
   
1,836,495
     
-
     
1,836,495
     
1,088,413
     
-
     
1,088,413
 
                                                 
Total
  $
51,951,463
    $
(18,854,683
)   $
33,096,780
    $
46,525,481
    $
(9,492,947
)   $
37,032,534
 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
   
September 30,
     
 
 
   
 
 
   
2020
   
2021
   
2022
   
2023
   
2024
   
Thereafter
   
Total
 
                                                         
Customer relationships
  $
10,065,957
    $
8,951,436
    $
1,647,446
    $
-
    $
-
    $
-
    $
20,664,839
 
Permits, licenses, and lease acquisition costs
   
936,232
     
936,232
     
936,232
     
936,232
     
936,232
     
4,328,085
     
9,009,245
 
Site location
   
56,623
     
56,623
     
56,623
     
56,623
     
56,623
     
443,665
     
726,780
 
Noncompetition agreements
   
121,145
     
104,950
     
95,200
     
64,851
     
1,992
     
-
     
388,138
 
Trade names and trademarks
   
65,658
     
64,900
     
64,900
     
64,900
     
64,900
     
146,025
     
471,283
 
                                                         
Total
  $
11,245,615
    $
10,114,141
    $
2,800,401
    $
1,122,606
    $
1,059,747
    $
4,917,775
    $
31,260,285
 
Customer relationships
   
20
 
Permits, licenses, and lease acquisition costs
   
116
 
Site location
   
154
 
Noncompetition agreements
   
37
 
Trade names and trademarks
   
56