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v3.21.1

Contracts in progress (Tables) | 12 Months Ended
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Dec. 31, 2020
Contracts in progress |
Summary of information relative to revenue recognized and amounts billed on contracts in progress | Revenue recognized and amounts billed on contracts in progress are summarized as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2020 | ​ | 2019
Revenue recognized to date on contracts in progress | ​ | $ | 17,534,449 |  | $ | 16,054,699
Amounts billed to date on contracts in progress | ​ |  | (17,791,928) | ​ |  | (15,078,830)
Retainage | ​ | ​ | 312,130 | ​ | ​ | 361,556
Net contract asset | ​ | $ | 54,651 | ​ | $ | 1,337,425
​ The above net balances are reflected in the accompanying consolidated balance sheet as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2020 | ​ | 2019
Contract assets | ​ | $ | 516,521 |  | $ | 1,677,041
Contract liabilities | ​ |  | (461,870) | ​ |  | (339,616)
Net contract asset | ​ | $ | 54,651 | ​ | $ | 1,337,425

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- Definition Tabular disclosure for revenue recognized and amounts billed with regard to contracts with customers in progress. + References No definition available. + Details
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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