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Note 10 - Short-term and Long-term Borrowings (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Line of Credit Facilities [Table Text Block]

(in thousands)		Line Limit				In Use on December 31, 2019				Restricted due to Outstanding Letters of Credit				Available on December 31, 2019				Available on December 31, 2018
Otter Tail Corporation Credit Agreement		$	170,000			$	6,000			$	-			$	164,000			$	120,785
OTP Credit Agreement			170,000				-				15,476				154,524				160,316
Total		$	340,000			$	6,000			$	15,476			$	318,524			$	281,101

Schedule of Debt [Table Text Block]

December 31, 2019 (in thousands)		OTP				Otter Tail Corporation				Otter Tail Corporation Consolidated
Short-Term Debt		$	-			$	6,000			$	6,000
Long-Term Debt:
3.55% Guaranteed Senior Notes, due December 15, 2026						$	80,000			$	80,000
Senior Unsecured Notes 4.63%, Series 2011A, due December 1, 2021		$	140,000								140,000
Senior Unsecured Notes 6.15%, Series 2007B, due August 20, 2022			30,000								30,000
Senior Unsecured Notes 6.37%, Series 2007C, due August 20, 2027			42,000								42,000
Senior Unsecured Notes 4.68%, Series 2013A, due February 27, 2029			60,000								60,000
Senior Unsecured Notes 3.07%, Series 2019A, due October 10, 20291			10,000								10,000
Senior Unsecured Notes 6.47%, Series 2007D, due August 20, 2037			50,000								50,000
Senior Unsecured Notes 3.52%, Series 2019B, due October 10, 2039			26,000								26,000
Senior Unsecured Notes 5.47%, Series 2013B, due February 27, 2044			90,000								90,000
Senior Unsecured Notes 4.07%, Series 2018A, due February 7, 2048			100,000								100,000
Senior Unsecured Notes 3.82%, Series 2019C, due October 10, 2049			64,000								64,000
PACE Note, 2.54%, due March 18, 2021							351				351
Total		$	612,000			$	80,351			$	692,351
Less: Current Maturities net of Unamortized Debt Issuance Costs			-				183				183
Unamortized Long-Term Debt Issuance Costs			2,231				356				2,587
Total Long-Term Debt net of Unamortized Debt Issuance Costs		$	609,769			$	79,812			$	689,581
Total Short-Term and Long-Term Debt (with current maturities)		$	609,769			$	85,995			$	695,764

December 31, 2018 (in thousands)		OTP				Otter Tail Corporation				Otter Tail Corporation Consolidated
Short-Term Debt		$	9,384			$	9,215			$	18,599
Long-Term Debt:
3.55% Guaranteed Senior Notes, due December 15, 2026						$	80,000			$	80,000
Senior Unsecured Notes 4.63%, Series 2011A, due December 1, 2021		$	140,000								140,000
Senior Unsecured Notes 6.15%, Series 2007B, due August 20, 2022			30,000								30,000
Senior Unsecured Notes 6.37%, Series 2007C, due August 20, 2027			42,000								42,000
Senior Unsecured Notes 4.68%, Series 2013A, due February 27, 2029			60,000								60,000
Senior Unsecured Notes 6.47%, Series 2007D, due August 20, 2037			50,000								50,000
Senior Unsecured Notes 5.47%, Series 2013B, due February 27, 2044			90,000								90,000
Senior Unsecured Notes 4.07%, Series 2018A, due February 7, 2048			100,000								100,000
PACE Note, 2.54%, due March 18, 2021							523				523
Total		$	512,000			$	80,523			$	592,523
Less: Current Maturities net of Unamortized Debt Issuance Costs			-				172				172
Unamortized Long-Term Debt Issuance Costs			1,942				407				2,349
Total Long-Term Debt net of Unamortized Debt Issuance Costs		$	510,058			$	79,944			$	590,002
Total Short-Term and Long-Term Debt (with current maturities)		$	519,442			$	89,331			$	608,773

Schedule of Maturities of Long-term Debt [Table Text Block]

(in thousands)		2020				2021				2022				2023				2024
Aggregate Amounts of Debt Maturities		$	183			$	140,168			$	30,000			$	-			$	-

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