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Note 9 - Derivative Instruments and Hedging Activities (Details Textual) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2017 | Mar. 31, 2015 | Feb. 28, 2014 | Mar. 31, 2018 | Dec. 31, 2017
Derivative, Notional Amount |  |  |  | $ 5,731 | $ 5,813
Interest Rate Swap [Member] |  |  |  |  |
Derivative, Term of Contract | 10 years | 14 years | 15 years |  |
Derivative, Notional Amount | $ 1,280 | $ 1,200 | $ 4,370 |  |

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

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- 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

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