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Note 19 - Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Quarterly Financial Information [Table Text Block]
 
 
2016
 
 
 
Three Months Ended
 
 
 
March 31
 
 
June 30
 
 
September 30
 
 
December 31
 
 
 
(in thousands, except per share data)
 
                                 
Operating revenues
   $
103,589
     $
111,516
     $
109,393
     $
108,354
  
Operating expenses and costs
    
98,003
      
104,162
      
104,098
      
106,661
  
                                 
Operating income
    
5,586
      
7,354
      
5,295
      
1,693
  
Non-operating (loss) income
    
(22
 )    
(10
 )    
1,235
      
282
  
Interest expense
    
(822
 )    
(910
 )    
(927
 )    
(982
 )
Income tax expense
    
(1,807
 )    
(2,442
 )    
(2,152
 )    
(270
 )
                                 
Net income
   $
2,935
     $
3,992
     $
3,451
     $
723
  
                                 
Net income per common share:
                                
Basic
   $
0.41
     $
0.61
     $
0.54
     $
0.11
  
Diluted
   $
0.41
     $
0.61
     $
0.53
     $
0.11
  
                                 
Average common shares outstanding:
                                
Basic
    
7,121
      
6,551
      
6,439
      
6,400
  
Diluted
    
7,145
      
6,572
      
6,458
      
6,425
  
 
 
2015
 
 
 
Three Months Ended
 
 
 
March 31
 
 
June 30
 
 
September 30
 
 
December 31
 
 
 
(in thousands, except per share data)
 
                                 
Operating revenues
   $
99,483
     $
108,033
     $
107,110
     $
102,424
  
Operating expenses and costs
    
90,336
      
96,151
      
96,884
      
97,449
  
                                 
Operating income
    
9,147
      
11,882
      
10,226
      
4,975
  
Non-operating income (loss)
    
245
      
272
      
(132
 )    
1,131
  
Interest expense
    
(617
 )    
(644
 )    
(732
 )    
(825
 )
Income tax expense
    
(3,406
 )    
(4,471
 )    
(3,567
 )    
(2,048
 )
                                 
Net income
   $
5,369
     $
7,039
     $
5,795
     $
3,233
  
                                 
Net income per common share:
                                
Basic
   $
0.72
     $
0.95
     $
0.81
     $
0.45
  
Diluted
   $
0.72
     $
0.94
     $
0.80
     $
0.45
  
                                 
Average common shares outstanding:
                                
Basic
    
7,425
      
7,431
      
7,186
      
7,116
  
Diluted
    
7,467
      
7,474
      
7,219
      
7,144