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

3 Months Ended

Mar. 31, 2019

Notes Tables

Schedule of Line of Credit Facilities [Table Text Block]

(in thousands)	Line Limit		In Use on March 31, 2019		Restricted due to Outstanding Letters of Credit		Available on March 31, 2019		Available on December 31, 2018
Otter Tail Corporation Credit Agreement	$	130,000	$	27,742	$	--	$	102,258	$	120,785
OTP Credit Agreement		170,000		15,859		300		153,841		160,316
Total	$	300,000	$	43,601	$	300	$	256,099	$	281,101

Schedule of Debt [Table Text Block]

March 31, 201 9 (in thousands)	OTP		Otter Tail Corporation		Otter Tail Corporation Consolidated
Short-Term Debt	$	15,859	$	27,742	$	43,601
Long-Term Debt:
3.55% Guaranteed Senior Notes, due December 15, 2026			$	80,000	$	80,000
Senior Unsecured Notes 4.63%, due December 1, 2021	$	140,000				140,000
Senior Unsecured Notes 6.15%, Series B, due August 20, 2022		30,000				30,000
Senior Unsecured Notes 6.37%, Series C, due August 20, 2027		42,000				42,000
Senior Unsecured Notes 4.68%, Series A, due February 27, 2029		60,000				60,000
Senior Unsecured Notes 6.47%, Series D, due August 20, 2037		50,000				50,000
Senior Unsecured Notes 5.47%, Series B, 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				480		480
Total	$	512,000	$	80,480	$	592,480
Less: Current Maturities net of Unamortized Debt Issuance Costs		--		174		174
Unamortized Long-Term Debt Issuance Costs		1,890		394		2,284
Total Long-Term Debt net of Unamortized Debt Issuance Costs	$	510,110	$	79,912	$	590,022
Total Short-Term and Long-Term Debt (with current maturities)	$	525,969	$	107,828	$	633,797

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%, due December 1, 2021	$	140,000				140,000
Senior Unsecured Notes 6.15%, Series B, due August 20, 2022		30,000				30,000
Senior Unsecured Notes 6.37%, Series C, due August 20, 2027		42,000				42,000
Senior Unsecured Notes 4.68%, Series A, due February 27, 2029		60,000				60,000
Senior Unsecured Notes 6.47%, Series D, due August 20, 2037		50,000				50,000
Senior Unsecured Notes 5.47%, Series B, 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