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Significant Accounting policies (Details Narrative) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Provision for doubtful debt | $ 629,000 | $ 373,000 | $ 1,607,000
Depreciation method | straight-line |  |
Useful life | 25 years |  |
Salvage value per light weight ton | $ 300 | 300 |
Revenue recognition method | straight line |  |
Operating Lease, Right-of-Use Asset | $ 48,256,000 | 886,000 |
Operating Lease, Liability, Noncurrent | $ 48,256,000 | 886,000 |
Office Building [Member] |  |  |
Operating Lease, Weighted Average Discount Rate, Percent | 4.00% |  |
Operating Lease, Right-of-Use Asset | $ 552,000 | 886,000 |
Operating Lease, Liability, Noncurrent | $ 552,000 | 886,000 |
Operating lease expense recognition method | straight line |  |
Operating Lease, Weighted Average Remaining Lease Term | 2 years 3 days |  |
Operating lease expense | $ 501,000 | 461,000 | $ 352,000
Charter In Vessels [Member] |  |  |
Operating Lease, Weighted Average Discount Rate, Percent | 3.00% |  |
Operating Lease, Right-of-Use Asset | $ 47,704,000 | 0 |
Operating Lease, Liability, Noncurrent | $ 47,704,000 | $ 0 |
Lessee, Operating Lease, Description | initial term of 12 months or less |  |
Operating lease expense recognition method | straight line |  |
Operating Lease, Weighted Average Remaining Lease Term | 5 years 10 months 6 days |  |

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- Definition A description of the operating lease expense recognition method. + References No definition available. + Details
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- Definition A description of the revenue recognition method. + References No definition available. + Details
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- Definition Description of lessee's operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Weighted average discount rate for operating lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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- Definition Description of the methodology for computing depreciation for classes of depreciable assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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