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Note 7 - Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Intangible Assets and Goodwill [Table Text Block]
   
March 31, 2019
   
December 31, 2018
 
   
 
 
 
 
Accumulated
   
 
 
 
 
 
 
 
 
Accumulated
   
 
 
 
   
Cost
   
Amortization
   
Balance
   
Cost
   
Amortization
   
Balance
 
                                                 
Customer relationships
  $
32,841,900
    $
(10,885,769
)   $
21,956,131
    $
32,638,900
    $
(8,326,564
)   $
24,312,336
 
Permits, licenses, and lease acquisition costs
   
9,621,521
     
(773,576
)    
8,847,945
     
9,599,621
     
(559,285
)    
9,040,336
 
Site location
   
849,347
     
(94,178
)    
755,169
     
849,347
     
(80,216
)    
769,131
 
Noncompetition agreements
   
616,000
     
(175,987
)    
440,013
     
614,000
     
(145,517
)    
468,483
 
Trade names and
trademarks
   
722,200
     
(213,917
)    
508,283
     
722,200
     
(195,417
)    
526,783
 
Technology
   
138,000
     
(134,156
)    
3,844
     
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
   
1,187,413
     
-
     
1,187,413
     
1,088,413
     
-
     
1,088,413
 
                                                 
Total
  $
46,004,381
    $
(12,305,583
)   $
33,698,798
    $
46,525,481
    $
(9,492,947
)   $
37,032,534
 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
   
March 31,
   
 
 
 
 
 
 
 
   
2019
   
2020
   
2021
   
2022
   
2023
   
Thereafter
   
Total
 
                                                         
Customer relationships
  $
9,937,564
    $
8,606,874
    $
3,411,693
    $
-
    $
-
    $
-
    $
21,956,131
 
Permits, licenses, and lease acquisition costs
   
869,732
     
869,732
     
869,732
     
869,732
     
869,732
     
4,499,285
     
8,847,945
 
Site location
   
56,623
     
56,623
     
56,623
     
56,623
     
56,623
     
472,054
     
755,169
 
Noncompetition agreements
   
123,200
     
112,165
     
95,450
     
81,365
     
27,833
     
-
     
440,013
 
Trade names and trademarks
   
70,208
     
64,900
     
64,900
     
64,900
     
64,900
     
178,475
     
508,283
 
Technology
   
3,844
     
-
     
-
     
-
     
-
     
-
     
3,844
 
                                                         
Total
  $
11,061,171
    $
9,710,294
    $
4,498,398
    $
1,072,620
    $
1,019,088
    $
5,149,814
    $
32,511,385
 
Customer relationships
   
24
 
Permits, licenses, and lease acquisition costs
   
122
 
Site location
   
160
 
Noncompetition agreements
   
43
 
Trade names and trademarks
   
60
 
Technology
   
1