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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
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Regulatory Assets - Current $ 17,435 $ 21,650
Regulatory Assets - Long -Term 145,977 144,138
Regulatory Assets - Total 163,412 165,788
Regulatory Liabilities - Current 12,870 7,480
Regulatory Liabilities - Long -Term 236,892 239,906
Regulatory Liabilities - Total 249,762 247,386
Net Regulatory Asset Position - Current 4,565 14,170
Net Regulatory Asset Position - Long-Term (90,915) (95,768)
Net Regulatory Asset/(Liability) Position (86,350) (81,598)
Deferred Income Taxes [Member]    
Regulatory Liabilities - Current 0 0
Regulatory Liabilities - Long -Term 136,630 141,707
Regulatory Liabilities - Total 136,630 141,707
Accumulated Reserve for Estimated Removal Costs - Net of Salvage [Member]    
Regulatory Liabilities - Current 0 0
Regulatory Liabilities - Long -Term 99,617 97,726
Regulatory Liabilities - Total 99,617 97,726
Refundable Fuel Clause Adjustment Revenues [Member]    
Regulatory Liabilities - Current 9,208 3,982
Regulatory Liabilities - Long -Term 0 0
Regulatory Liabilities - Total $ 9,208 $ 3,982
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 12 months 12 months
North Dakota Transmission Cost Recovery Rider Accrued Refund [Member]    
Regulatory Liabilities - Current $ 1,233 $ 700
Regulatory Liabilities - Long -Term 0 0
Regulatory Liabilities - Total $ 1,233 $ 700
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 3 months 12 months
South Dakota Phase-in Rate Plan Rider Accrued Refund [Member]    
Regulatory Liabilities - Current $ 1,090 $ 355
Regulatory Liabilities - Long -Term 0 0
Regulatory Liabilities - Total $ 1,090 $ 355
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 11 months 9 months
Revenue for Rate Case Expenses Subject to Refund - Minnesota [Member]    
Regulatory Liabilities - Current $ 0 $ 0
Regulatory Liabilities - Long -Term 577 401
Regulatory Liabilities - Total 577 401
Prior Service Costs and Actuarial Losses on Pensions and Other Postretirement Benefits [Member]    
Regulatory Liabilities - Current 471 471
Regulatory Liabilities - Long -Term 0 0
Regulatory Liabilities - Total $ 471 $ 471
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 12 months 12 months
North Dakota Renewable Resource Recovery Rider Accrued Refund [Member]    
Regulatory Liabilities - Current $ 444 $ 1,515
Regulatory Liabilities - Long -Term 0 0
Regulatory Liabilities - Total $ 444 $ 1,515
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 6 months 12 months
Minnesota Energy Intensive Trade Exposed Rider Accrued Refund [Member]    
Regulatory Liabilities - Current $ 186 $ 164
Regulatory Liabilities - Long -Term 0 0
Regulatory Liabilities - Total $ 186 $ 164
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 12 months 12 months
South Dakota Transmission Cost Recovery Rider Accrued Refund [Member]    
Regulatory Liabilities - Current $ 232  
Regulatory Liabilities - Long -Term 0  
Regulatory Liabilities - Total $ 232  
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 5 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
Other [Member]    
Regulatory Liabilities - Current $ 6 $ 6
Regulatory Liabilities - Long -Term 68 72
Regulatory Liabilities - Total $ 74 $ 78
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 159 months 168 months
Prior Service Costs and Actuarial Losses on Pensions and Other Postretirement Benefits [Member]    
Regulatory Assets - Current [1] $ 9,018 $ 9,090
Regulatory Assets - Long -Term [1] 122,765 129,102
Regulatory Assets - Total [1] 131,783 138,192
Minnesota Transmission Cost Recovery Rider Accrued Revenues [Member]    
Regulatory Assets - Current [2] 3,676 4,208
Regulatory Assets - Long -Term [2] 6,126 0
Regulatory Assets - Total [2] $ 9,802 $ 4,208
Regulatory Assets - Remaining Recovery/Refund Period (Month) [2] 27 months 12 months
Accumulated Asset Retirement Obligation (ARO) Accretion/Depreciation Adjustment [Member]    
Regulatory Assets - Current [1] $ 0 $ 0
Regulatory Assets - Long -Term [1] 8,481 7,772
Regulatory Assets - Total [2] 8,481 7,772
Conservation Improvement Program Costs and Incentives [Member]    
Regulatory Assets - Current [2] 1,040 4,024
Regulatory Assets - Long -Term [2] 2,094 2,844
Regulatory Assets - Total [2] $ 3,134 $ 6,868
Regulatory Assets - Remaining Recovery/Refund Period (Month) [2] 24 months 21 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] 2,149 1,681
Regulatory Assets - Total [1] 2,149 1,681
MISO Schedule 26/26A Transmission Cost Recovery Rider True-up [Member]    
Regulatory Assets - Current [1] 1,234 2,033
Regulatory Assets - Long -Term [1] 559 968
Regulatory Assets - Total [1] $ 1,793 $ 3,001
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 27 months 24 months
Unrecovered Project Costs – Minnesota [Member]    
Regulatory Assets - Current [1] $ 401 $ 715
Regulatory Assets - Long -Term [1] 1,092 225
Regulatory Assets - Total [1] $ 1,493 $ 940
Regulatory Assets - Remaining Recovery/Refund Period (Month) 21 months 16 months [1]
Minnesota Renewable Resource Rider Accrued Revenues [Member]    
Regulatory Assets - Current [2] $ 1,203 $ 131
Regulatory Assets - Long -Term [2] 0 0
Regulatory Assets - Total [2] $ 1,203 $ 131
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 12 months 12 months
Unrecovered Project Costs – North Dakota [Member]    
Regulatory Assets - Current [1] $ 0  
Regulatory Assets - Long -Term [1] 856  
Regulatory Assets - Total [1] $ 856  
Regulatory Assets - Remaining Recovery/Refund Period (Month) 21 months  
Minnesota SPP Transmission Cost Recovery Tracker [Member]    
Regulatory Assets - Current [1] $ 0 $ 0
Regulatory Assets - Long -Term [1] 759 202
Regulatory Assets - Total [1] 759 202
Debt Reacquisition Premiums [Member]    
Regulatory Assets - Current [1] 204 201
Regulatory Assets - Long -Term [1] 379 548
Regulatory Assets - Total [1] $ 583 $ 749
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 144 months 153 months
Unrecovered Project Costs – South Dakota [Member]    
Regulatory Assets - Current [1] $ 144 $ 144
Regulatory Assets - Long -Term [1] 357 253
Regulatory Assets - Total [1] $ 501 $ 397
Regulatory Assets - Remaining Recovery/Refund Period (Month) 24 months 33 months [1]
South Dakota Deferred Rate Case Expenses Subject to Recovery [Member]    
Regulatory Assets - Current [1] $ 137 $ 138
Regulatory Assets - Long -Term [1] 143 245
Regulatory Assets - Total [1] $ 280 $ 383
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 25 months 34 months
North Dakota Deferred Rate Case Expenses Subject to Recovery [Member]    
Regulatory Assets - Current [1] $ 122 $ 122
Regulatory Assets - Long -Term [1] 152 244
Regulatory Assets - Total [1] $ 274 $ 366
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 27 months 36 months
Deferred Marked-to-Market Losses [Member]    
Regulatory Assets - Current [1] $ 186 $ 743
Regulatory Assets - Total [1] $ 186 $ 743
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 3 months 12 months
Deferred Lease Expenses [Member]    
Regulatory Assets - Current [1] $ 0 $ 0
Regulatory Assets - Long -Term [1] 65 54
Regulatory Assets - Total [1] $ 65 $ 54
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 56 months 39 months
North Dakota Generation Cost Recovery Rider Accrued Revenues [Member]    
Regulatory Assets - Current [2] $ 66  
Regulatory Assets - Long -Term [2] 0  
Regulatory Assets - Total [2] $ 66  
Regulatory Assets - Remaining Recovery/Refund Period (Month) [2] 9 months  
Minnesota Environmental Cost Recovery Rider Accrued Revenues [Member]    
Regulatory Assets - Current [2] $ 4 $ 4
Regulatory Assets - Long -Term [2] 0 0
Regulatory Assets - Total [2] $ 4 $ 4
Regulatory Assets - Remaining Recovery/Refund Period (Month) [2] 12 months 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 - Remaining Recovery/Refund Period (Month) [2]   2 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.