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Income taxes (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
TonnageTaxes	$ 2,103	$ 2,087	$ 1,506
Income tax	$ 152	$ 109	$ 61

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- Definition

The tonnage taxes for the period.

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No definition available.

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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