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Note 4 - Investment in Unconsolidated Affiliates - Company Operations Due to Affiliates (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Due to Sonatide at beginning of year |  | $ 32,767 | $ 31,475 | $ 29,347
Plus commissions payable to Sonatide |  | 3,832 | 4,152 | 4,937
Plus amounts paid by Sonatide on behalf of the company |  | 10,914 | 9,037 | 9,654
Less commissions paid to Sonatide |  | 0 | 0 | (5,961)
Less amounts used to offset Due from Sonatide obligations (A) | [1] | (8,530) | (11,848) | (10,551)
Other |  | 1,449 | (49) | 4,049
Due to Affiliate |  | $ 40,432 | $ 32,767 | $ 31,475
[1] | We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture.

X
- Definition The amounts paid by the affiliate on behalf of the company. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

X
- Definition The amount of commissions to be paid to the affiliate. + References No definition available. + Details
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X
- Definition Amount of commission paid due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition The amount of increase (decrease) in due to affiliate, classified as other. + References No definition available. + Details
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X
- Definition The amount used to offset obligations of due from affiliate to due to affiliate amounts. + References No definition available. + Details
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X
- Definition Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.12(3)) -URI http://asc.fasb.org/extlink&oid=120401414&loc=d3e603758-122996 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(3)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.17) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=124433192&loc=d3e56071-112765 + Details
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