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Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

+ References

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- Definition

Amount of cash and cash equivalent, and cash and cash equivalent restricted to withdrawal or usage; attributable to continuing operation. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

+ References

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Cash and Cash Equivalents (Details) - USD ($)	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025	Dec. 31, 2024
Cash and Cash Equivalents [Abstract]
Money market accounts – cash equivalents	$ 31,652,000	$ 24,828,000
Time deposit accounts - cash equivalents	30,704,000	3,000,000
Cash	43,319,000	75,226,000
Cash and Cash Equivalents [Line Items]
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation	105,945,000	103,324,000	$ 59,253,000
Restricted cash	270,000	270,000
Cash and cash equivalents	$ 105,675,000	103,054,000	$ 59,253,000	$ 86,805,000
Pangaea
Cash and Cash Equivalents [Line Items]
Ownership percentage	100.00%
NBHC
Cash and Cash Equivalents [Line Items]
Ownership percentage	66.67%
Deck Barge
Cash and Cash Equivalents [Line Items]
Ownership percentage	50.00%
Pangaea
Cash and Cash Equivalents [Line Items]
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation	$ 100,577,000	95,228,000
NBHC
Cash and Cash Equivalents [Line Items]
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation	5,045,000	7,784,000
NBP
Cash and Cash Equivalents [Line Items]
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation	$ 323,000	$ 312,000