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Note 9 - Derivative Instruments and Hedging Activities (Details Textual) - USD ($) $ in Thousands			1 Months Ended
	Mar. 31, 2015	Feb. 28, 2014	Aug. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Derivative, Notional Amount				$ 5,892	$ 4,835
Interest Rate Swap [Member]
Derivative, Term of Contract	14 years	15 years	10 years
Derivative, Notional Amount	$ 1,200	$ 4,370	$ 1,280

X

- 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

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: