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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
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Regulatory Assets - Current $ 20,358 $ 21,650
Regulatory Assets - Long -Term 142,734 144,138
Regulatory Assets - Total 163,092 165,788
Regulatory Liabilities - Current 9,804 7,480
Regulatory Liabilities - Long -Term 239,108 239,906
Regulatory Liabilities - Total 248,912 247,386
Net Regulatory Asset Position - Current 10,554 14,170
Net Regulatory Asset Position - Long-Term (96,374) (95,768)
Net Regulatory Asset/(Liability) Position (85,820) (81,598)
Deferred Income Taxes [Member]    
Regulatory Liabilities - Current 0 0
Regulatory Liabilities - Long -Term 140,112 141,707
Regulatory Liabilities - Total 140,112 141,707
Accumulated Reserve for Estimated Removal Costs - Net of Salvage [Member]    
Regulatory Liabilities - Current 0 0
Regulatory Liabilities - Long -Term 98,465 97,726
Regulatory Liabilities - Total 98,465 97,726
Refundable Fuel Clause Adjustment Revenues [Member]    
Regulatory Liabilities - Current 8,078 3,982
Regulatory Liabilities - Long -Term 0 0
Regulatory Liabilities - Total $ 8,078 $ 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 $ 662 $ 700
Regulatory Liabilities - Long -Term 0 0
Regulatory Liabilities - Total $ 662 $ 700
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 $ 471
Regulatory Liabilities - Long -Term 0 0
Regulatory Liabilities - Total $ 471 $ 471
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 12 months 12 months
Revenue for Rate Case Expenses Subject to Refund - Minnesota [Member]    
Regulatory Liabilities - Current $ 0 $ 0
Regulatory Liabilities - Long -Term 460 401
Regulatory Liabilities - Total 460 401
North Dakota Renewable Resource Recovery Rider Accrued Refund [Member]    
Regulatory Liabilities - Current 325 1,515
Regulatory Liabilities - Long -Term 0 0
Regulatory Liabilities - Total $ 325 $ 1,515
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 12 months 12 months
Minnesota Energy Intensive Trade Exposed Rider Accrued Refund [Member]    
Regulatory Liabilities - Current $ 201 $ 164
Regulatory Liabilities - Long -Term 0 0
Regulatory Liabilities - Total $ 201 $ 164
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 11 months 12 months
South Dakota Transmission Cost Recovery Rider Accrued Refund [Member]    
Regulatory Liabilities - Current $ 33  
Regulatory Liabilities - Long -Term 0  
Regulatory Liabilities - Total $ 33  
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 11 months  
North Dakota Generation Cost Recovery Rider Accrued Refund [Member]    
Regulatory Liabilities - Current $ 28 $ 287
Regulatory Liabilities - Long -Term 0 0
Regulatory Liabilities - Total $ 28 $ 287
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 12 months 6 months
Other [Member]    
Regulatory Liabilities - Current $ 6 $ 6
Regulatory Liabilities - Long -Term 71 72
Regulatory Liabilities - Total $ 77 $ 78
Regulatory Liabilities - Remaining Recovery/Refund Period (Month) 165 months 168 months
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
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] 127,038 129,102
Regulatory Assets - Total [1] 136,056 138,192
Accumulated Asset Retirement Obligation (ARO) Accretion/Depreciation Adjustment [Member]    
Regulatory Assets - Current [1] 0 0
Regulatory Assets - Long -Term [1] 8,007 7,772
Regulatory Assets - Total [2] 8,007 7,772
Minnesota Transmission Cost Recovery Rider Accrued Revenues [Member]    
Regulatory Assets - Current [2] 5,965 4,208
Regulatory Assets - Long -Term [2] 0 0
Regulatory Assets - Total [2] $ 5,965 $ 4,208
Regulatory Assets - Remaining Recovery/Refund Period (Month) [2] 12 months 12 months
Conservation Improvement Program Costs and Incentives [Member]    
Regulatory Assets - Current [2] $ 1,288 $ 4,024
Regulatory Assets - Long -Term [2] 3,511 2,844
Regulatory Assets - Total [2] $ 4,799 $ 6,868
Regulatory Assets - Remaining Recovery/Refund Period (Month) [2] 18 months 21 months
MISO Schedule 26/26A Transmission Cost Recovery Rider True-up [Member]    
Regulatory Assets - Current [1] $ 1,767 $ 2,033
Regulatory Assets - Long -Term [1] 928 968
Regulatory Assets - Total [1] $ 2,695 $ 3,001
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 21 months 24 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] 1,826 1,681
Regulatory Assets - Total [1] 1,826 1,681
Big Stone II Unrecovered Project Costs - Minnesota [Member]    
Regulatory Assets - Current [1] 724 715
Regulatory Assets - Long -Term [1] 38 225
Regulatory Assets - Total [1] $ 762 $ 940
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 13 months 16 months
Debt Reacquisition Premiums [Member]    
Regulatory Assets - Current [1] $ 204 $ 201
Regulatory Assets - Long -Term [1] 482 548
Regulatory Assets - Total [1] $ 686 $ 749
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 150 months 153 months
Deferred Marked-to-Market Losses [Member]    
Regulatory Assets - Current [1] $ 557 $ 743
Regulatory Assets - Total [1] $ 557 $ 743
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 9 months 12 months
Big Stone II Unrecovered Project Costs - South Dakota [Member]    
Regulatory Assets - Current [1] $ 144 $ 144
Regulatory Assets - Long -Term [1] 217 253
Regulatory Assets - Total [1] $ 361 $ 397
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 30 months 33 months
Minnesota Renewable Resource Rider Accrued Revenues [Member]    
Regulatory Assets - Current [2] $ 354 $ 131
Regulatory Assets - Long -Term [2] 0 0
Regulatory Assets - Total [2] $ 354 $ 131
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 12 months 12 months
South Dakota Deferred Rate Case Expenses Subject to Recovery [Member]    
Regulatory Assets - Current [1] $ 138 $ 138
Regulatory Assets - Long -Term [1] 211 245
Regulatory Assets - Total [1] $ 349 $ 383
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 31 months 34 months
North Dakota Deferred Rate Case Expenses Subject to Recovery [Member]    
Regulatory Assets - Current [1] $ 122 $ 122
Regulatory Assets - Long -Term [1] 213 244
Regulatory Assets - Total [1] $ 335 $ 366
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 33 months 36 months
Minnesota SPP Transmission Cost Recovery Tracker [Member]    
Regulatory Assets - Current [1] $ 0 $ 0
Regulatory Assets - Long -Term [1] 206 202
Regulatory Assets - Total [1] 206 202
South Dakota Phase-in Rate Plan Rider Accrued Refund [Member]    
Regulatory Assets - Current [2] 73  
Regulatory Assets - Long -Term [2] 0  
Regulatory Assets - Total [2] $ 73  
Regulatory Assets - Remaining Recovery/Refund Period (Month) [2] 12 months  
Deferred Lease Expenses [Member]    
Regulatory Assets - Current [1] $ 0 0
Regulatory Assets - Long -Term [1] 57 54
Regulatory Assets - Total [1] $ 57 $ 54
Regulatory Assets - Remaining Recovery/Refund Period (Month) [1] 36 months 39 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.