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Note 11 - Financial Instruments - Derivative Liabilities (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 USD ($)
ABN Bank [Member] | Interest Rate Swap June 3, 2016 [Member] |
Effective Date | Apr. 13, 2018
Derivative, Notional Amount | $ 16,575
Derivative, Interest Rate | 1.4425%
ABN Bank [Member] | Interest Rate Swap December 19, 2016 [Member] |
Effective Date | Dec. 21, 2016
Derivative, Notional Amount | $ 20,700
Derivative, Interest Rate | 2.08%
Nord/ LB Bank [Member] | Interest Rate Swap March 29, 2017 [Member] |
Effective Date | May 17, 2017
Derivative, Notional Amount | $ 21,139
Derivative, Interest Rate | 2.19%
Alpha Bank [Member] | Interest Rate Swap March 29, 2018 [Member] |
Effective Date | Mar. 29, 2018
Derivative, Notional Amount | $ 21,900
Derivative, Interest Rate | 2.97%

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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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Balance Type: | na
Period Type: | instant

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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