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Note 19 - Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
201
7
  
   
Three Months Ended
  
   
March 31
    
June 30
    
September 30
    
December 31
  
   
(in thousands, except per share data)
  
                                 
Operating revenues
   $
109,405
     $
108,646
     $
108,899
     $
110,888
  
Operating expenses and costs
    
106,743
      
105,748
      
105,131
      
107,536
  
                                 
Operating income
    
2,662
      
2,898
      
3,768
      
3,352
  
Non-operating
(loss) income
    
2,052
      
650
      
2,767
      
384
  
Interest expense
    
(977
 )    
(935
 )    
(920
 )    
(1,070
 )
Income tax
(benefit) expense
    
(1,454
 )    
(1,004
 )    
(2,169
 )    
28,895
  
                                 
Net income
   $
2,283
     $
1,609
     $
3,446
     $
31,561
  
                                 
Net income per common share:
                                
Basic
   $
0.36
     $
0.25
     $
0.54
     $
5.07
  
Diluted
   $
0.36
     $
0.25
     $
0.54
     $
5.00
  
                                 
Average common shares outstanding:
                                
Basic
    
6,399
      
6,381
      
6,326
      
6,219
  
Diluted
    
6,425
      
6,430
      
6,373
      
6,312
  
   
201
6
  
   
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 income (loss)
    
(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