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Note 7 - Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Intangible Assets and Goodwill [Table Text Block]
   
September 30, 2018
   
December 31, 2017
 
   
 
 
 
 
Accumulated
   
 
 
 
 
 
 
 
 
Accumulated
   
 
 
 
   
Cost
   
Amortization
   
Balance
   
Cost
   
Amortization
   
Balance
 
                                                 
Customer relationships
  $
32,638,900
    $
(5,652,893
)   $
26,986,007
    $
8,132,900
    $
(2,970,533
)   $
5,162,367
 
Permits, licenses, and lease acquisition costs
   
9,599,621
     
(340,166
)    
9,259,455
     
2,184,106
     
(178,835
)    
2,005,271
 
Site location
   
849,347
     
(66,060
)    
783,287
     
849,347
     
(23,593
)    
825,754
 
Noncompetition and nonsolicitation agreements
   
614,000
     
(114,817
)    
499,183
     
285,000
     
(66,417
)    
218,583
 
Trade names and trademarks
   
722,200
     
(176,917
)    
545,283
     
722,200
     
(112,250
)    
609,950
 
Technology
   
138,000
     
(111,159
)    
26,841
     
138,000
     
(76,662
)    
61,338
 
Nonsolicitation agreement
   
28,000
     
(28,000
)    
-
     
28,000
     
(28,000
)    
-
 
Favorable leases
   
1,425,000
     
(23,750
)    
1,401,250
     
-
     
-
     
-
 
Easements
   
941,413
     
-
     
941,413
     
466,360
     
-
     
466,360
 
                                                 
Total
  $
46,956,481
    $
(6,513,762
)   $
40,442,719
    $
12,805,913
    $
(3,456,290
)   $
9,349,623
 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
   
September 30,
   
 
 
 
 
 
 
 
   
2019
   
2020
   
2021
   
2022
   
2023
   
Thereafter
   
Total
 
                                                         
Customer relationships
  $
10,306,727
    $
9,186,562
    $
7,492,718
    $
-
    $
-
    $
-
    $
26,986,007
 
Permits, licenses and lease acquisition costs
   
867,542
     
867,542
     
867,542
     
867,542
     
867,542
     
4,921,745
     
9,259,455
 
Site location
   
56,623
     
56,623
     
56,623
     
56,623
     
56,623
     
500,172
     
783,287
 
Noncompetition and nonsolicitation agreements
   
122,800
     
118,717
     
102,550
     
92,800
     
62,316
     
-
     
499,183
 
Trade names and trademarks
   
74,000
     
65,658
     
64,900
     
64,900
     
64,900
     
210,925
     
545,283
 
Technology
   
26,841
     
-
     
-
     
-
     
-
     
-
     
26,841
 
Favorable leases
   
142,500
     
142,500
     
142,500
     
142,500
     
142,500
     
688,750
     
1,401,250
 
                                                         
Total
  $
11,597,033
    $
10,437,602
    $
8,726,833
    $
1,224,365
    $
1,193,881
    $
6,321,592
    $
39,501,306
 
Customer relationships
   
30
 
Permits, licenses, and lease acquisition costs
   
128
 
Site location
   
166
 
Noncompetition and nonsolicitation agreements
   
49
 
Trade names and trademarks
   
64
 
Technology
   
7
 
Favorable leases
   
118