Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating Loss Carryforwards [Line Items]
U.S. federal statutory income tax rate	21.00%	21.00%	21.00%
Operating loss carryforwards, limitations on use	The Company also has indefinite life carryforwards as a result of interest limitations. Starting in 2022, the Company has research costs attributable to research and development that are currently expensed but are required to be capitalized for U.S. tax purposes and amortized primarily over 5 or 15 years.
Interest and penalties recorded	$ 0	$ 0	$ 0
Proposed global minimum tax percentage	15.00%
Deferred tax assets valuation allowance	$ 5,489,000	7,315,000
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Research and development expense amortized period	5 years
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Research and development expense amortized period	15 years
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Loss carryforwards for federal income tax purposes	$ 6,500,000	2,900,000
Deferred tax assets valuation allowance	0	0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Loss carryforwards for federal income tax purposes	173,200,000	184,500,000
Valuation allowance for net operating loss carryforwards	$ 5,500,000	7,300,000
State and Local Jurisdiction [Member] \| Minimum [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards expiration year	2030
State and Local Jurisdiction [Member] \| Maximum [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards expiration year	2045
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance for net operating loss carryforwards	$ 0	$ 0

Great Lakes Dredge & Dock CORP 10-K/A