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Schedule 1 - Condensed Financial Information of Registrant - Related Party Transactions (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts Receivable | $ 2,144 | $ 1,931
Interest Receivable | 117 | 117
Current Notes Receivable | 0 | 1,167
Long-Term Notes Receivable | 79,251 | 79,422
Accounts Payable | 7 | 7
Current Notes Payable | 89,611 | 60,626
Otter Tail Corporation [Member] | Otter Tail Power Company [Member] |  |
Accounts Receivable | 2,056 | 1,877
Interest Receivable | 0 | 0
Current Notes Receivable | 0 | 0
Long-Term Notes Receivable | 0 | 0
Accounts Payable | 7 | 7
Current Notes Payable | 0 | 0
Otter Tail Corporation [Member] | Northern Pipe Products, Inc. [Member] |  |
Accounts Receivable | 0 | 0
Interest Receivable | 8 | 8
Current Notes Receivable | 0 | 0
Long-Term Notes Receivable | 5,351 | 5,522
Accounts Payable | 0 | 0
Current Notes Payable | 3,056 | 5,623
Otter Tail Corporation [Member] | Vinyltech Corporation [Member] |  |
Accounts Receivable | 4 | 4
Interest Receivable | 17 | 17
Current Notes Receivable | 0 | 0
Long-Term Notes Receivable | 11,500 | 11,500
Accounts Payable | 0 | 0
Current Notes Payable | 15,099 | 15,305
Otter Tail Corporation [Member] | BTD Manufacturing, Inc. [Member] |  |
Accounts Receivable | 0 | 0
Interest Receivable | 77 | 77
Current Notes Receivable | 0 | 415
Long-Term Notes Receivable | 52,000 | 52,000
Accounts Payable | 0 | 0
Current Notes Payable | 18,474 | 0
Otter Tail Corporation [Member] | T. O. Plastics, Inc. [Member] |  |
Accounts Receivable | 0 | 0
Interest Receivable | 15 | 15
Current Notes Receivable | 0 | 0
Long-Term Notes Receivable | 10,400 | 10,400
Accounts Payable | 0 | 0
Current Notes Payable | 3,099 | 14,308
Otter Tail Corporation [Member] | Varistar Corporation [Member] |  |
Accounts Receivable | 0 | 0
Interest Receivable | 0 | 0
Current Notes Receivable | 0 | 752
Long-Term Notes Receivable | 0 | 0
Accounts Payable | 0 | 0
Current Notes Payable | 49,883 | 25,390
Otter Tail Corporation [Member] | Otter Tail Assurance Limited [Member] |  |
Accounts Receivable | 84 | 50
Interest Receivable | 0 | 0
Current Notes Receivable | 0 | 0
Long-Term Notes Receivable | 0 | 0
Accounts Payable | 0 | 0
Current Notes Payable | $ 0 | $ 0

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