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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Contract assets	$ 0	$ 445,000
Contract liability	4,807,000	$ 6,930,000
Performance obligation	14,850,000
Fasemex [Member]
Related Party Transaction, Expenses from Transactions with Related Party	$ 89,984,000
Maximum [Member]
Warranty period	5 years
Useful life of assets related to state and local incentives	16 years
Maximum [Member] | Railcar Sales [Member]
Contract payment term	10 days
Maximum [Member] | Parts Sales [Member]
Contract payment term	45 days
Minimum [Member]
Useful life of assets related to state and local incentives	7 years
Minimum [Member] | Railcar Sales [Member]
Contract payment term	5 days
Minimum [Member] | Parts Sales [Member]
Contract payment term	30 days

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- Definition

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- Definition

Useful life of assets related to state and local incentives in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

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- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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