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Note 14 - Income Tax Expense - Continuing Operations (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
Three Months Ended March 31,
  
(in thousands)
  
2019
    
2018
  
Income Before Income Taxes
   $
31,952
     $
30,009
  
Tax Computed at Company’s Net Composite Federal and State Statutory Rate (26%)
    
8,308
      
7,802
  
Increases (Decreases) in Tax from:
                
Differences Reversing in Excess of Federal Rates
    
(983
 )    
(1,073
 )
Excess Tax Deduction – Equity Method Stock Awards
    
(827
 )    
(624
 )
Corporate Owned Life Insurance
    
(409
 )    
(8
 )
North Dakota Wind Tax Credit Amortization – Net of Federal Taxes
    
(258
 )    
(258
 )
Research and Development and Other Tax Credits
    
(188
 )    
(180
 )
Allowance for Funds Used During Construction – Equity
    
(86
 )    
(167
 )
Federal Production Tax Credits (PTCs)
    
--
      
(1,120
 )
Other Comprehensive Income Deferred Tax Rate Adjustment
    
--
      
(531
 )
Other Items – Net
    
71
      
(47
 )
Income Tax Expense
   $
5,628
     $
3,794
  
Effective Income Tax Rate
    
17.6
 %    
12.6
 %
Summary of Income Tax Contingencies [Table Text Block]
(in thousands)
  
2019
    
2018
  
Balance on January 1
   $
1,282
     $
684
  
Increases Related to Tax Positions for Current Year
    
38
      
36
  
Uncertain Positions Resolved During Year
    
--
      
(44
 )
Balance on March 31
   $
1,320
     $
676