Gross sales price of long-lived, physical assets used in the normal conduct of business.

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Accrued performance bonus granted to related party.

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Term of renewal of agreement with a related party, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Date the declared dividend will be paid, in YYYY-MM-DD format.

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Date the holder must own the stock to be entitled to the dividend, in YYYY-MM-DD format.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity.

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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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Aggregate dividends paid during the period for each share of preferred stock outstanding.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Number of shares authorized for issuance under share-based payment arrangement.

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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands									1 Months Ended			12 Months Ended
	Apr. 15, 2025	Mar. 18, 2025	Mar. 12, 2025	Jan. 21, 2025	Jan. 15, 2025	Feb. 21, 2024	Mar. 07, 2023	Apr. 15, 2022	Mar. 31, 2025	Oct. 31, 2024	Sep. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Apr. 14, 2025	Mar. 11, 2025	Jan. 14, 2025
Subsequent Events [Abstract]
Preferred stock, shares outstanding (in shares)												533,136	520,459
Loss on sale of vessel												$ (7)	$ 0	$ 0
Payment for equity method investment												1,375	1,643	0
RFSea [Member]
Subsequent Events [Abstract]
Payment for equity method investment										$ 1,375	$ 1,375
Related Party [Member] \| Steamship [Member]
Subsequent Events [Abstract]
Accrued performance bonus												$ 225
Related Party [Member] \| Steamship [Member] \| Brokerage Services [Member]
Subsequent Events [Abstract]
Renewal term of agreement												1 year
M/V Salt Lake City [Member] \| Plan [Member]
Subsequent Events [Abstract]
Loss on sale of vessel				$ (600)
Series D Preferred Stock [Member]
Subsequent Events [Abstract]
Dividends paid on preferred stock												$ 1,022	$ 968	117
Preferred stock, shares outstanding (in shares)												23,083	13,738
Series C Preferred Stock [Member]
Subsequent Events [Abstract]
Dividends paid on preferred stock												$ 614	$ 1,121	$ 780
Preferred stock, shares outstanding (in shares)												8,853	5,521
Series C Preferred Stock [Member] \| 2021 Equity Incentive Plan [Member]
Subsequent Events [Abstract]
Awards granted (in shares)							3,332	1,982				3,332	3,332	1,982
Vesting period												2 years	2 years	2 years
Series C Preferred Stock [Member] \| Restricted Shares [Member] \| 2021 Equity Incentive Plan [Member]
Subsequent Events [Abstract]
Awards granted (in shares)						3,332
Subsequent Event [Member] \| RFSea [Member]
Subsequent Events [Abstract]
Payment for equity method investment		$ 1,375							$ 1,375
Subsequent Event [Member] \| Related Party [Member] \| Steamship [Member] \| Brokerage Services [Member]
Subsequent Events [Abstract]
Renewal term of agreement			1 year
Subsequent Event [Member] \| M/V Salt Lake City [Member]
Subsequent Events [Abstract]
Sales price				$ 16,100
Subsequent Event [Member] \| Series C Preferred Stock [Member] \| 2021 Equity Incentive Plan [Member]
Subsequent Events [Abstract]
Number of shares authorized to be delivered pursuant to awards granted (in shares)																25,000
Subsequent Event [Member] \| Series C Preferred Stock [Member] \| Restricted Shares [Member]
Subsequent Events [Abstract]
Awards granted (in shares)			3,332
Vesting period			2 years
Subsequent Event [Member] \| Quarterly Dividend Declared for Q4-2024 [Member] \| Series D Preferred Stock [Member]
Subsequent Events [Abstract]
Dividend payable, date to be paid					Jan. 15, 2025
Preferred stock dividend paid per share (in dollars per share)					$ 17.5
Dividends paid on preferred stock					$ 404
Preferred stock, shares outstanding (in shares)																	23,083
Dividend payable, date of record					Jan. 14, 2025
Subsequent Event [Member] \| Quarterly Dividend Declared for Q4-2024 [Member] \| Series C Preferred Stock [Member]
Subsequent Events [Abstract]
Dividend payable, date to be paid					Jan. 15, 2025
Preferred stock dividend paid per share (in dollars per share)					$ 20
Dividends paid on preferred stock					$ 177
Preferred stock, shares outstanding (in shares)																	8,853
Dividend payable, date of record					Jan. 14, 2025
Subsequent Event [Member] \| Quarterly Dividend Declared for Q1-2025 [Member] \| Series D Preferred Stock [Member]
Subsequent Events [Abstract]
Dividend payable, date to be paid	Apr. 15, 2025
Preferred stock dividend paid per share (in dollars per share)	$ 17.5
Dividends paid on preferred stock	$ 404
Preferred stock, shares outstanding (in shares)															23,083
Dividend payable, date of record	Apr. 14, 2025
Subsequent Event [Member] \| Quarterly Dividend Declared for Q1-2025 [Member] \| Series C Preferred Stock [Member]
Subsequent Events [Abstract]
Dividend payable, date to be paid	Apr. 15, 2025
Preferred stock dividend paid per share (in dollars per share)	$ 20
Dividends paid on preferred stock	$ 202
Preferred stock, shares outstanding (in shares)															8,853
Dividend payable, date of record	Apr. 14, 2025
Subsequent Event [Member] \| Quarterly Dividend Declared for Q1-2025 [Member] \| Directors [Member] \| Series C Preferred Stock [Member]
Subsequent Events [Abstract]
Preferred stock, shares outstanding (in shares)			3,332