XML 44 R30.htm IDEA: XBRL DOCUMENT v3.8.0.1
Note 13 - Income Tax Expense - Continuing Operations (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
Three Months Ended March 31,
  
(in thousands)
  
2018
    
2017
  
Income Before Income Taxes – Continuing Operations
   $
30,009
     $
25,892
  
Tax Computed at Company’s Net Composite Federal and State Statutory Rate (26% for first quarter 2018, 39% for first quarter 2017)
    
7,802
      
10,098
  
Increases (Decreases) in Tax from:
                
Federal Production Tax Credits
    
(1,120
 )    
(2,052
 )
Property Related Differences and Other Regulatory Adjustments
    
(1,073
 )    
105
  
Excess Tax Deduction – Equity Method Stock Awards
    
(624
 )    
(697
 )
Other Comprehensive Income Deferred Tax Rate Adjustment
    
(531
 )    
--
  
North Dakota Wind Tax Credit Amortization – Net of Federal Taxes
    
(258
 )    
(212
 )
Research and Development and Other Tax Credits
    
(180
 )    
(157
 )
Allowance for Funds Used During Construction – Equity
    
(167
 )    
(67
 )
Corporate Owned Life Insurance
    
(8
 )    
(294
 )
Section 199 Domestic Production Activities Deduction
    
--
      
(330
 )
Other Items – Net
    
(47
 )    
(31
 )
Income Tax Expense – Continuing Operations
   $
3,794
     $
6,363
  
Effective Income Tax Rate – Continuing Operations
    
12.6
 %    
24.6
 %
Summary of Income Tax Contingencies [Table Text Block]
(in thousands)
  
2018
    
2017
  
Balance on January 1
   $
684
     $
891
  
Decreases Related to Tax Positions for Prior Years
    
(44
 )    
--
  
Increases Related to Tax Positions for Current Year
    
36
      
43
  
Uncertain Positions Resolved During Year
    
--
      
--
  
Balance on March 31
   $
676
     $
934