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Contracts in progress (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Contracts in progress
Revenues recognized to date on contracts in process	$ 17,534,449	$ 16,054,699
Amounts billed to date on contracts in process	(17,791,928)	(15,078,830)
Retainage	312,130	361,556
Net contract asset	54,651	1,337,425
Contract assets	516,521	1,677,041
Contract liabilities	$ (461,870)	$ (339,616)

X

- Definition

The amount billed for contracts with customers during the period.

+ References

No definition available.

+ Details

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X

- Definition

The net amount of overbillings for contracts with customers, during the period.

+ References

No definition available.

+ Details

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X

- Definition

Amount of retainage with contract for customers.

+ References

No definition available.

+ Details

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X

- 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, classified as current.

+ References

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-Publisher FASB
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-SubTopic 10
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X

- Definition

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

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X

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X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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