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Contract Assets and Contract Liabilities (Details) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
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Costs and estimated earnings on uncompleted contracts |  |
Costs incurred on uncompleted contracts | $ 412,479 | $ 513,558
Estimated earnings to date on uncompleted contracts | 131,934 | 127,032
Gross contract assets | 544,413 | 640,590
Less: billings to date | (668,959) | (703,532)
Net contract assets (liabilities) | $ (124,546) | $ (62,942)

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- Definition Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 310 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118388040&loc=d3e49370-109356 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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