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Note 17 - Investments in Unconsolidated Joint Ventures (Details Textual) - USD ($) $ in Thousands			1 Months Ended	12 Months Ended
	Apr. 24, 2020	Mar. 12, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity Method Investment, Other than Temporary Impairment				$ (0)	$ 3,144	$ (0)
Excess of Purchase Price Over Book Value of Vessels				60,850	(0)	$ 22,260
Clearlake Shipping Pte Ltd [Member]
Time Charters, Term (Year)			5 years
Time Charters, Term, Additional Option (Year)			2 years
California 19 Inc. [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 37,660
Debt Instrument, Term (Year)		5 years
California 19 Inc. [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate		3.00%
California 19 Inc. [Member] | M/T Eco Holmby Hills [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 18,830
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid		18,830
California 19 Inc. [Member] | M/T Eco Palm Springs [Member]
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid		$ 18,830
The 2017 Joint Venture [Member]
OCI, Equity Method Investment, before Tax					(391)
Equity Method Investment, Other than Temporary Impairment					$ 3,144
Equity Method Investment, Realized Gain (Loss) on Disposal, Total				64
Proceeds from Sale of Equity Method Investments				$ 19,555
The 2020 Joint Venture [Member]
Equity Method Investment, Ownership Percentage	50.00%
Payments to Acquire Equity Method Investments	$ 27,000
Excess Basis, Amortization Period (Year)	25 years
The 2020 Joint Venture [Member] | CSI [Member]
Fees Due to Related Parties	$ 454
California 19 Inc. [Member]
Equity Method Investment, Ownership Percentage				50.00%
Excess of Purchase Price Over Book Value of Vessels	1,646
Excess of Purchase Price Over Fair Value of Vessels	1,963
California 20 Inc. [Member]
Equity Method Investment, Ownership Percentage				50.00%
Excess of Purchase Price Over Book Value of Vessels	1,654
Excess of Purchase Price Over Fair Value of Vessels	$ 1,963

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The amortization period of the excess basis.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Amount of gain (loss) on sale or disposal of an equity method investment.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, before tax, of other comprehensive income (loss) (OCI) for proportionate share of equity method investee's OCI.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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