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Significant Accounting policies (Details Narrative) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Provision for doubtful debt	$ 373,000	$ 1,607,000	$ 722,000
Depreciation method	straight-line
Useful life	25 years
Salvage value per light weight ton	$ 300	300
Revenue recognition method	straight line
Operating lease expense recognition method	straight line
Office Building [Member]
Annual incremental borrowing rate	4.00%
Operating lease expense	$ 461,000	$ 352,000	$ 403,000

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A description of the operating lease expense recognition method.

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A description of the revenue recognition method.

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The estimated vessels' salvage value per lightweight ton.

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Amount of operating lease expense. Excludes sublease income.

+ References

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-Publisher FASB
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-SubTopic 20
-Section 45
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Weighted average discount rate for operating lease calculated at point in time.

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Description of the methodology for computing depreciation for classes of depreciable assets.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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