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

6 Months Ended

Jun. 30, 2017

Notes Tables

Schedule of Line of Credit Facilities [Table Text Block]

(in thousands)	Line Limit		In Use on June 30 , 2017		Restricted due to Outstanding Letters of Credit		Available on June 30 , 2017		Available on December 31, 201 6
Otter Tail Corporation Credit Agreement	$	130,000	$	117	$	--	$	129,883	$	130,000
OTP Credit Agreement		170,000		58,000		300		111,700		127,067
Total	$	300,000	$	58,117	$	300	$	241,583	$	257,067

Schedule of Debt [Table Text Block]

June 30 , 201 7 (in thousands)	OTP		Otter Tail Corporation		Otter Tail Corporation Consolidated
Short-Term Debt	$	58,000	$	117	$	58,117
Long-Term Debt:
Term Loan, LIBOR plus 0.90%, due February 5, 2018			$	9,000	$	9,000
3.55% Guaranteed Senior Notes, due December 15, 2026				80,000		80,000
Senior Unsecured Notes 5.95%, Series A, due August 20, 2017	$	33,000				33,000
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
North Dakota Development Note, 3.95%, due April 1, 2018				67		67
P artnership in Assisting Community Expansion (PACE) Note, 2.54%, due March 18, 2021				761		761
Total	$	445,000	$	89,828	$	534,828
Less: Current Maturities net of Unamortized Debt Issuance Costs		32,993		9,207		42,200
Unamortized Long-Term Debt Issuance Costs		1,742		500		2,242
Total Long-Term Debt net of Unamortized Debt Issuance Costs	$	410,265	$	80,121	$	490,386
Total Short-Term and Long-Term Debt (with current maturities)	$	501,258	$	89,445	$	590,703

December 31, 2016 (in thousands)	OTP		Otter Tail Corporation		Otter Tail Corporation Consolidated
Short-Term Debt	$	42,883	$	--	$	42,883
Long-Term Debt:
Term Loan, LIBOR plus 0.90%, due February 5, 2018			$	15,000	$	15,000
3.55% Guaranteed Senior Notes, due December 15, 2026				80,000		80,000
Senior Unsecured Notes 5.95%, Series A, due August 20, 2017	$	33,000				33,000
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
North Dakota Development Note, 3.95%, due April 1, 2018				106		106
PACE Note, 2.54%, due March 18, 2021				836		836
Total	$	445,000	$	95,942	$	540,942
Less: Current Maturities net of Unamortized Debt Issuance Costs		32,970		231		33,201
Unamortized Long-Term Debt Issuance Costs		1,861		539		2,400
Total Long-Term Debt net of Unamortized Debt Issuance Costs	$	410,169	$	95,172	$	505,341
Total Short-Term and Long-Term Debt (with current maturities)	$	486,022	$	95,403	$	581,425