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Note 14 - Income Tax Expense - Continuing Operations (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
Three Months Ended
June 30,
    
Six Months Ended
June 30,
  
(in thousands)
  
201
7
    
201
6
    
201
7
    
201
6
  
Income Before Income Taxes
– Continuing Operations
   $
22,614
     $
20,639
     $
48,506
     $
40,621
  
Tax Computed at Company
’s Net Composite Federal and State
Statutory Rate (39%)
    
8,819
      
8,049
      
18,917
      
15,842
  
Increases (Decreases) in Tax from:
                                
Federal Production Tax Credits
    
(2,010
 )    
(1,885
 )    
(4,062
 )    
(3,571
 )
Excess Tax Deduction
– 2014 Performance Share Awards
    
--
      
--
      
(697
 )    
--
  
Section 199 Domestic Production Activities Deduction
    
(330
 )    
(94
 )    
(660
 )    
(198
 )
Corporate
-Owned Life Insurance
    
(207
 )    
(480
 )    
(501
 )    
(572
 )
North Dakota Wind Tax Credit Amortization –
Net of Federal Taxes
    
(213
 )    
(213
 )    
(425
 )    
(425
 )
Employee Stock Ownership Plan Dividend Deduction
    
(173
 )    
(157
 )    
(345
 )    
(315
 )
Other Items
– Net
    
11
      
(137
 )    
33
      
(186
 )
Income Tax Expense
–
Continuing Operations
   $
5,897
     $
5,083
     $
12,260
     $
10,575
  
Effective Income Tax Rate
– Continuing Operations
    
26.1
 %    
24.6
 %    
25.3
 %    
26.0
 %
Summary of Income Tax Contingencies [Table Text Block]
(in thousands)
  
201
7
    
201
6
  
Balance on January 1
   $
891
     $
468
  
Increases Related to Tax Positions for Prior Years
    
--
      
--
  
Increases Related to Tax Positions for Current Year
    
147
      
26
  
Uncertain Positions Resolved During Year
    
--
      
--
  
Balance on June 30
   $
1,038
     $
494