Quarterly report pursuant to Section 13 or 15(d)

Construction Contract and Other Service Revenues - Narrative (Details)

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Construction Contract and Other Service Revenues - Narrative (Details) - Construction Contract Revenue - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Capitalized contract cost, net $ 0 $ 0 $ 0
Contract with customer, receivable, credit loss expense $ 412,000 $ 463,000