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Note 3 - Derivative Instruments and Hedging Activities - Interest Rate Swaps Qualifying as Cash Flow Hedges (Details) $ in Millions	1 Months Ended
	Aug. 31, 2017 USD ($)
Interest Rate Swap Agreement One [Member]
Contract Date	Aug. 09, 2017
Effective Date	Jul. 01, 2018
Notional Amount	$ 125
Fixed LIBOR Rate	1.6298%
Expiration Date	Jul. 01, 2019
Interest Rate Swap Agreement Two [Member]
Contract Date	Aug. 09, 2017
Effective Date	Jul. 01, 2019
Notional Amount	$ 125
Fixed LIBOR Rate	1.8598%
Expiration Date	Jul. 01, 2020
Interest Rate Swap Agreement Three [Member]
Contract Date	Aug. 09, 2017
Effective Date	Jul. 01, 2020
Notional Amount	$ 125
Fixed LIBOR Rate	2.0848%
Expiration Date	Jul. 01, 2021
Interest Rate Swap Agreement Four [Member]
Contract Date	Aug. 09, 2017
Effective Date	Jul. 01, 2021
Notional Amount	$ 125
Fixed LIBOR Rate	2.301%
Expiration Date	Jul. 01, 2022
Interest Rate Swap Agreement Five [Member]
Contract Date	Aug. 09, 2017
Effective Date	Jul. 01, 2022
Notional Amount	$ 125
Fixed LIBOR Rate	2.4848%
Expiration Date	May 31, 2023
Interest Rate Swap Agreement Six [Member]
Contract Date	Aug. 30, 2017
Effective Date	Jul. 01, 2018
Notional Amount	$ 125
Fixed LIBOR Rate	1.5503%
Expiration Date	Jul. 01, 2019
Interest Rate Swap Agreement Seven [Member]
Contract Date	Aug. 30, 2017
Effective Date	Jul. 01, 2019
Notional Amount	$ 125
Fixed LIBOR Rate	1.7553%
Expiration Date	Jul. 01, 2020
Interest Rate Swap Agreement Eight [Member]
Contract Date	Aug. 30, 2017
Effective Date	Jul. 01, 2020
Notional Amount	$ 125
Fixed LIBOR Rate	1.9803%
Expiration Date	Jul. 01, 2021
Interest Rate Swap Agreement Nine [Member]
Contract Date	Aug. 30, 2017
Effective Date	Jul. 01, 2021
Notional Amount	$ 125
Fixed LIBOR Rate	2.2228%
Expiration Date	Jul. 01, 2022
Interest Rate Swap Agreement Ten [Member]
Contract Date	Aug. 30, 2017
Effective Date	Jul. 01, 2022
Notional Amount	$ 125
Fixed LIBOR Rate	2.4153%
Expiration Date	May 31, 2023

X

- Definition

Date the derivative contract become effective, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

+ References

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- Definition

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+ References

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