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Note 2 - Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
 
  
As Reported
   
 
 
 
  
Under ASC 605
    
As Reported
   
 
 
 
  
Under ASC 605
  
   
for the Three
    
Adjustments
    
for the Three
    
for the Six
    
Adjustments
    
for the Six
  
   
Months Ended
    
Due to
    
Months Ended
    
Months Ended
    
Due to
    
Months Ended
  
   
June 30, 2018
    
ASC 606
    
June 30, 2018
    
June 30, 2018
    
ASC 606
    
June 30, 2018
  
                                                 
Consolidated Statement of Comprehensive Income (Loss)
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Operating revenues
    
449,758
      
14
      
449,772
      
875,466
      
(151
 )    
875,315
  
Total operating expenses
    
429,740
      
1,019
      
430,759
      
840,594
      
1,541
      
842,135
  
Operating income
    
20,018
      
(1,005
 )    
19,013
      
34,872
      
(1,692
 )    
33,180
  
Income (loss) before income tax benefit
    
(156
 )    
(1,005
 )    
(1,161
 )    
1,819
      
(1,692
 )    
127
  
Income tax provision
    
(1,191
 )    
(291
 )    
(1,482
 )    
(598
 )    
(491
 )    
(1,089
 )
Net income (loss)
    
1,035
      
(714
 )    
321
      
2,417
      
(1,201
 )    
1,216
  
Net income (loss) attributable to controlling interest
    
615
      
(714
 )    
(99
 )    
1,774
      
(1,201
 )    
573
  
Basic earnings (loss) per share
    
0.04
      
(0.05
 )    
(0.01
 )    
0.17
      
(0.12
 )    
0.06
  
Basic weighted average shares outstanding
    
14,214
      
14,214
      
14,214
      
10,321
      
10,321
      
10,321
  
Diluted earnings (loss) per share
    
0.04
      
(0.05
 )    
(0.01
 )    
0.17
      
(0.12
 )    
0.05
  
Diluted weighted average shares outstanding
    
14,456
      
14,456
      
14,456
      
10,443
      
10,443
      
10,443
  
   
Reported
    
Adjustments
    
Under ASC 605
  
   
Balance at
    
Due to
    
Balance at
  
Consolidated Balance Sheet
  
June 30, 2018
    
ASC 606
    
June 30, 2018
  
Customer receivables, net of allowance of $69 at June 30, 2018
   $
206,558
     $
(4,003
 )   $
202,555
  
Other current assets
    
15,892
      
(2,216
 )    
13,676
  
Total current assets
    
277,924
      
(6,219
 )    
271,705
  
Total assets
    
842,225
      
(6,219
 )    
836,006
  
Accounts payable
    
74,944
      
(2,600
 )    
72,344
  
Other accrued liabilities
    
5,420
      
(349
 )    
5,071
  
Deferred income taxes
    
14,787
      
(609
 )    
14,178
  
Accumulated deficit
    
(40,460
 )    
(2,661
 )    
(43,121
 )
Stockholder’s equity (deficit)
    
210,630
      
(2,661
 )    
207,969
  
Total stockholder's equity (deficit)
    
213,562
      
(2,661
 )    
210,901
  
Total liabilities, redeemable restricted units and stockholder's equity (deficit)
    
842,225
      
(6,219
 )    
836,006
  
                         
Operating Cash Flows
  
 
 
 
  
 
 
 
  
 
 
 
Net income (loss)
    
2,417
      
(1,201
 )    
1,216
  
Receivables
    
(17,531
 )    
(151
 )    
(17,682
 )
Other assets
    
(3,777
 )    
(1,751
 )    
(5,528
 )
Accounts payable and other accrued liabilities
    
(15,353
 )    
210
      
(15,143
 )
Deferred income tax benefit
    
(959
 )    
491
      
(468
 )