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Note 14 - Financial Instruments - Derivative Liabilities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Interest Rate Swap June 3, 2016 [Member] | ABN Bank [Member]
Effective Date	Apr. 13, 2018
Derivative, Notional Amount	$ 14,113
Derivative, Interest Rate	1.4425%
Interest Rate Swap December 19, 2016 [Member] | ABN Bank [Member]
Effective Date	Dec. 21, 2016
Derivative, Notional Amount	$ 14,888
Derivative, Interest Rate	2.08%
Interest Rate Swap March 29, 2018 [Member] | Alpha Bank [Member]
Effective Date	Mar. 29, 2018
Derivative, Notional Amount	$ 19,100
Derivative, Interest Rate	2.97%

X

- 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

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

+ Details

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X

- Details

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- Details

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- Details

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X

- Details

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- Details

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