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Note 4 - Regulatory Assets and Liabilities - Amount of Regulatory Assets and Liabilities Recorded on Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Regulatory Assets - Current $ 21,650 $ 17,225
Regulatory Assets - Long -Term 144,138 135,257
Regulatory Assets - Total 165,788 152,482
Regulatory Assets - Long -Term 144,138 135,257
Regulatory Liabilities - Current 7,480 738
Regulatory Liabilities - Long -Term 239,906 226,469
Regulatory Liabilities, Total 247,386 227,207
Net Regulatory Asset Position - Current 14,170 16,487
Net Regulatory Asset Position - Long-Term (95,768) (91,212)
Net Regulatory Asset/(Liability) Position (81,598) (74,725)
Deferred Income Taxes [Member]    
Regulatory Liabilities - Current 0 0
Regulatory Liabilities - Long -Term 141,707 142,779
Regulatory Liabilities, Total 141,707 142,779
Accumulated Reserve for Estimated Removal Costs - Net of Salvage [Member]    
Regulatory Liabilities - Current 0 0
Regulatory Liabilities - Long -Term 97,726 83,229
Regulatory Liabilities, Total 97,726 83,229
Refundable Fuel Clause Adjustment Revenues [Member]    
Regulatory Liabilities - Current 3,982 121
Regulatory Liabilities - Long -Term 0 0
Regulatory Liabilities, Total $ 3,982 $ 121
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 12 months 12 months
North Dakota Renewable Resource Recovery Rider Accrued Refund [Member]    
Regulatory Liabilities - Current $ 1,515 $ 177
Regulatory Liabilities - Long -Term 0 0
Regulatory Liabilities, Total $ 1,515 $ 177
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 12 months 12 months
North Dakota Transmission Cost Recovery Rider Accrued Refund [Member]    
Regulatory Liabilities - Current $ 700 $ 60
Regulatory Liabilities - Long -Term 0 0
Regulatory Liabilities, Total $ 700 $ 60
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 12 months 12 months
Prior Service Costs and Actuarial Losses on Pensions and Other Postretirement Benefits [Member]    
Regulatory Liabilities - Current $ 471  
Regulatory Liabilities - Long -Term 0  
Regulatory Liabilities, Total $ 471  
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 12 months  
Revenue for Rate Case Expenses Subject to Refund - Minnesota [Member]    
Regulatory Liabilities - Current $ 0 $ 0
Regulatory Liabilities - Long -Term 401 166
Regulatory Liabilities, Total 401 166
South Dakota Phase-in Rate Plan Rider Accrued Refund [Member]    
Regulatory Liabilities - Current 355  
Regulatory Liabilities - Long -Term 0  
Regulatory Liabilities, Total $ 355  
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 9 months  
MISO Schedule 26/26A Transmission Cost Recovery Rider True-up [Member]    
Regulatory Liabilities - Current   0
Regulatory Liabilities - Long -Term   187
Regulatory Liabilities, Total   $ 187
Regulatory Liabilities - Remaining Recovery/Refund Period (Month)   24 months
North Dakota Generation Cost Recovery Rider Accrued Refund [Member]    
Regulatory Liabilities - Current $ 287  
Regulatory Liabilities - Long -Term 0  
Regulatory Liabilities, Total $ 287  
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 6 months  
South Dakota Transmission Cost Recovery Rider Accrued Refund [Member]    
Regulatory Liabilities - Current   $ 168
Regulatory Liabilities - Long -Term   0
Regulatory Liabilities, Total   $ 168
Regulatory Liabilities - Remaining Recovery/Refund Period (Month)   12 months
Minnesota Energy Intensive Trade Exposed Rider Accrued Refund [Member]    
Regulatory Liabilities - Current $ 164  
Regulatory Liabilities - Long -Term 0  
Regulatory Liabilities, Total $ 164  
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 12 months  
South Dakota Environmental Cost Recovery Rider Accrued Refund [Member]    
Regulatory Liabilities - Current   $ 207
Regulatory Liabilities - Long -Term   0
Regulatory Liabilities, Total   $ 207
Regulatory Liabilities - Remaining Recovery/Refund Period (Month)   12 months
Other [Member]    
Regulatory Liabilities - Current $ 6 $ 5
Regulatory Liabilities - Long -Term 72 108
Regulatory Liabilities, Total $ 78 $ 113
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 168 months 180 months
Prior Service Costs and Actuarial Losses on Pensions and Other Postretirement Benefits [Member]    
Regulatory Assets - Current [1] $ 9,090 $ 6,346
Regulatory Assets - Long -Term [1] 129,102 118,433
Regulatory Assets - Total [1] 138,192 124,779
Regulatory Assets - Long -Term [1] 129,102 118,433
Accumulated Asset Retirement Obligation (ARO) Accretion/Depreciation Adjustment [Member]    
Regulatory Assets - Current [1] 0  
Regulatory Assets - Long -Term [1] 7,772  
Regulatory Assets - Total [2] 7,772  
Regulatory Assets - Long -Term [1] 7,772  
Accumulated ARO Accretion/Depreciation Adjustment [Member]    
Regulatory Assets - Current [1]   0
Regulatory Assets - Long -Term [1]   7,169
Regulatory Assets - Total [1]   7,169
Regulatory Assets - Long -Term [1]   7,169
Conservation Improvement Program Costs and Incentives [Member]    
Regulatory Assets - Current [2] 4,024 5,995
Regulatory Assets - Long -Term [2] 2,844 3,285
Regulatory Assets - Total [2] 6,868 9,280
Regulatory Assets - Long -Term [2] $ 2,844 $ 3,285
Regulatory Assets - Remaining Recovery/Refund Period (Month) [2] 21 months 21 months
Minnesota Transmission Cost Recovery Rider Accrued Revenues [Member]    
Regulatory Assets - Current [2] $ 4,208 $ 444
Regulatory Assets - Long -Term [2] 0 0
Regulatory Assets - Total [2] 4,208 444
Regulatory Assets - Long -Term [2] $ 0 $ 0
Regulatory Assets - Remaining Recovery/Refund Period (Month) [2] 12 months 12 months
MISO Schedule 26/26A Transmission Cost Recovery Rider True-up [Member]    
Regulatory Assets - Current [1] $ 2,033 $ 240
Regulatory Assets - Long -Term [1] 968 0
Regulatory Assets - Total [1] 3,001 240
Regulatory Assets - Long -Term [1] $ 968 $ 0
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 24 months 12 months
Nonservice Costs Components of Postretirement Benefits Capitalized for Ratemaking Purposes and Subject to Deferred Recovery [Member]    
Regulatory Assets - Current [1] $ 0 $ 0
Regulatory Assets - Long -Term [1] 1,681 986
Regulatory Assets - Total [1] 1,681 986
Regulatory Assets - Long -Term [1] 1,681 986
Big Stone II Unrecovered Project Costs - Minnesota [Member]    
Regulatory Assets - Current [1] 715 681
Regulatory Assets - Long -Term [1] 225 947
Regulatory Assets - Total [1] 940 1,628
Regulatory Assets - Long -Term [1] $ 225 $ 947
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 16 months 28 months
Debt Reacquisition Premiums [Member]    
Regulatory Assets - Current [1] $ 201 $ 207
Regulatory Assets - Long -Term [1] 548 753
Regulatory Assets - Total [1] 749 960
Regulatory Assets - Long -Term [1] $ 548 $ 753
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 153 months 165 months
Deferred Marked-to-Market Losses [Member]    
Regulatory Assets - Current [1] $ 743 $ 1,661
Regulatory Assets - Long -Term [1]   743
Regulatory Assets - Total [1] $ 743 2,404
Regulatory Assets - Long -Term [1]   $ 743
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 12 months 24 months
Big Stone II Unrecovered Project Costs - South Dakota [Member]    
Regulatory Assets - Current [1] $ 144 $ 100
Regulatory Assets - Long -Term [1] 253 342
Regulatory Assets - Total [1] 397 442
Regulatory Assets - Long -Term [1] $ 253 $ 342
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 33 months 53 months
South Dakota Deferred Rate Case Expenses Subject to Recovery [Member]    
Regulatory Assets - Current [1] $ 138 $ 178
Regulatory Assets - Long -Term [1] 245 0
Regulatory Assets - Total [1] 383 178
Regulatory Assets - Long -Term [1] $ 245 $ 0
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 34 months 12 months
North Dakota Deferred Rate Case Expenses Subject to Recovery [Member]    
Regulatory Assets - Current [1] $ 122 $ 455
Regulatory Assets - Long -Term [1] 244 0
Regulatory Assets - Total [1] 366 455
Regulatory Assets - Long -Term [1] $ 244 $ 0
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 36 months 12 months
Minnesota SPP Transmission Cost Recovery Tracker [Member]    
Regulatory Assets - Current [1] $ 0 $ 0
Regulatory Assets - Long -Term [1] 202 176
Regulatory Assets - Total [1] 202 176
Regulatory Assets - Long -Term [1] 202 176
Minnesota Renewable Resource Rider Accrued Revenues [Member]    
Regulatory Assets - Current [2] 131  
Regulatory Assets - Long -Term [2] 0  
Regulatory Assets - Total [2] 131  
Regulatory Assets - Long -Term [2] $ 0  
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 12 months  
Minnesota Renewable Resource Recovery Rider, Accrued Revenues [Member]    
Regulatory Assets - Current [2]   452
Regulatory Assets - Long -Term [2]   0
Regulatory Assets - Total [2]   452
Regulatory Assets - Long -Term [2]   $ 0
Regulatory Assets - Remaining Recovery/Refund Period (Month) [2]   12 months
South Dakota Transmission Cost Recovery Rider Accrued Revenues [Member]    
Regulatory Assets - Current [2] $ 97  
Regulatory Assets - Long -Term [2] 0  
Regulatory Assets - Total [2] 97  
Regulatory Assets - Long -Term [2] $ 0  
Regulatory Assets - Remaining Recovery/Refund Period (Month) [2] 2 months  
Minnesota Environmental Cost Recovery Rider Accrued Revenues [Member]    
Regulatory Assets - Current [2] $ 4 $ 121
Regulatory Assets - Long -Term [2] 0 0
Regulatory Assets - Total [2] 4 121
Regulatory Assets - Long -Term [2] $ 0 $ 0
Regulatory Assets - Remaining Recovery/Refund Period (Month) [2] 12 months 12 months
Deferred Lease Expenses [Member]    
Regulatory Assets - Current [1] $ 0  
Regulatory Assets - Long -Term [1] 54  
Regulatory Assets - Total [1] 54  
Regulatory Assets - Long -Term [1] $ 54  
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 39 months  
Deferred Income Taxes [Member]    
Regulatory Assets - Current [1]   $ 0
Regulatory Assets - Long -Term [1]   2,423
Regulatory Assets - Total [1]   2,423
Regulatory Assets - Long -Term [1]   2,423
Minnesota Energy Intensive Trade Exposed Rider Accrued Revenues [Member]    
Regulatory Assets - Current [1]   328
Regulatory Assets - Long -Term [1]   0
Regulatory Assets - Total [1]   328
Regulatory Assets - Long -Term [1]   $ 0
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1]   4 months
North Dakota Environmental Cost Recovery Rider Accrued Revenues [Member]    
Regulatory Assets - Current [2]   $ 17
Regulatory Assets - Long -Term [2]   0
Regulatory Assets - Total [2]   17
Regulatory Assets - Long -Term [2]   $ 0
Regulatory Assets - Remaining Recovery/Refund Period (Month) [2]   12 months
[1] Costs subject to recovery without a rate of return.
[2] Amount eligible for recovery under an alternative revenue program which includes an incentive or rate of return.