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Note 2 - Significant Accounting Policies - Impact of Adoption of ASC 842 (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Prepaid bareboat charter hire |  |  |  |  |
Prepaid bareboat charter hire |  |  |  |  |
Right of use assets from operating leases* |  | $ 18,717 | 21,905 | [1] |
Current portion of Operating lease liabilities |  | 4,985 | 4,771 |  |
Non-current portion of Operating lease liabilities |  | $ 9,283 | 11,857 |  |
Previous Accounting Guidance [Member] |  |  |  |  |
Prepaid bareboat charter hire |  |  | 1,656 |  |
Prepaid bareboat charter hire |  |  | 3,621 |  |
Right of use assets from operating leases* | [1] |  |  |  |
Current portion of Operating lease liabilities |  |  |  |  |
Non-current portion of Operating lease liabilities |  |  |  |  |
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |
Prepaid bareboat charter hire |  |  | (1,656) |  |
Prepaid bareboat charter hire |  |  | (3,621) |  |
Right of use assets from operating leases* | [1] |  | 21,905 |  |
Current portion of Operating lease liabilities |  |  | 4,771 |  |
Non-current portion of Operating lease liabilities |  |  | $ 11,857 |  |
[1] | The Company netted 5,277 which were previously recorded as Prepaid bareboat charter hire in the consolidated balance sheet as of December 31, 2018 against the Operating lease right-of-use asset upon adoption of ASC 842 on January 1, 2019. The Prepaid bareboat charter hire represented the unamortized balance of losses from the sale of the Bareboat chartered in vessels that were being amortized over the duration of the leases.

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + 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=77888419&loc=SL77918627-209977 + 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=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + 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 (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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