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Note 2 - Revenue Recognition (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
2019
   
2018
 
   
Accounted
for Under
ASC 606
   
Accounted
for Under
Other
Guidance
   
Total
Revenue
   
Accounted
for Under
ASC 606
   
Accounted
for Under
Other
Guidance
   
Total
Revenue
 
Business and Wholesale Revenue
                                               
Business broadband
  $
61,549
    $
-
    $
61,549
    $
60,697
    $
-
    $
60,697
 
Business voice and other
   
27,394
     
-
     
27,394
     
28,429
     
-
     
28,429
 
Managed IT services
   
6,494
     
-
     
6,494
     
5,742
     
-
     
5,742
 
Equipment sales and installations
   
4,698
     
-
     
4,698
     
5,127
     
-
     
5,127
 
Wholesale broadband
   
36,408
     
-
     
36,408
     
31,931
     
-
     
31,931
 
Wholesale voice and other
   
5,617
     
-
     
5,617
     
6,000
     
-
     
6,000
 
Operating leases and other deferred revenue
   
-
     
8,404
     
8,404
     
-
     
6,668
     
6,668
 
                                                 
Total Business and Wholesale Revenue
   
142,160
     
8,404
     
150,564
     
137,926
     
6,668
     
144,594
 
                                                 
Consumer Revenue
                                               
Broadband
   
26,589
     
-
     
26,589
     
26,144
     
-
     
26,144
 
Voice and other
   
10,431
     
-
     
10,431
     
11,158
     
-
     
11,158
 
                                                 
Total Consumer Revenue
   
37,020
     
-
     
37,020
     
37,302
     
-
     
37,302
 
                                                 
Regulatory Revenue
                                               
Access
(1)
   
19,942
     
-
     
19,942
     
23,982
     
-
     
23,982
 
Access
(2)
   
-
     
4,474
     
4,474
     
-
     
6,896
     
6,896
 
High-cost support
   
-
     
19,694
     
19,694
     
-
     
19,694
     
19,694
 
                                                 
Total Regulatory Revenue
   
19,942
     
24,168
     
44,110
     
23,982
     
26,590
     
50,572
 
                                                 
Total Revenue
  $
199,122
    $
32,572
    $
231,694
    $
199,210
    $
33,258
    $
232,468
 
Revenue Accounted for In Accordance with ASC 606, By Timing of Revenue Recognition [Table Text Block]
   
2019
   
2018
 
                 
Services transferred over time
  $
174,482
    $
170,101
 
Goods transferred at a point in time
   
4,698
     
5,127
 
Regulatory access revenue
(1)
   
19,942
     
23,982
 
                 
Total revenue
  $
199,122
    $
199,210
 
   
2019
   
2018
 
                 
Balance at beginning of period
  $
8,052
    $
6,898
 
Contract additions
   
3,070
     
4,881
 
Amortization
   
(3,797
)    
(3,727
)
Impairments
   
(83
)    
-
 
Balance at end of period
  $
7,242
    $
8,052
 
   
2019
   
2018
 
                 
Balance at beginning of period
  $
2,766
    $
1,150
 
Contract additions
   
2,575
     
2,407
 
Revenue recognized
   
(1,438
)    
(791
)
Balance at end of period
  $
3,903
    $
2,766