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Costs and Estimated Earnings on Uncompleted Contracts (Narrative) (Details) - Customer Concentration Risk [Member] - Contract with Customer [Member] - customer	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Concentration Risk [Line Items]
Number of significant customers	2	2
Eight Largest Customers [Member]
Concentration Risk [Line Items]
Concentration risk percentage	95.00%	96.70%

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- Definition

Number of significant customers.

+ References

No definition available.

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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

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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