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Accounts Receivable | 12 Months Ended
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Dec. 31, 2021
Receivables [Abstract] |
Accounts Receivable | 3. Accounts Receivable Accounts receivable consisted of the following:
|  | December 31, |
(table only in thousands) |  | 2021 |  |  | 2020 |
Contract receivables |  | $ | 65,932 |  |  | $ | 57,435 |
Trade receivables |  |  | 12,537 |  |  |  | 8,721 |
Allowance for doubtful accounts |  |  | (3,478 | ) |  |  | (3,110 | )
Total accounts receivable |  | $ | 74,991 |  |  | $ | 63,046 |
Balances billed, but not paid by customers under retainage provisions in contracts, amounted to approximately $1.8 million and $1.5 million at December 31, 2021 and 2020, respectively. Retainage receivables on contracts in progress are generally collected within a year or two subsequent to contract completion, and are recorded in either accounts receivable, net or deferred charges and other assets within the Consolidated Balance Sheets depending on timing of expected collection. Provision for doubtful accounts was $0.7 million, $0.9 million and $0.3 million during 2021, 2020 and 2021, respectively, while accounts charged to the allowance were $0.3 million, $0.4 million and $0.6 million during 2021, 2020 and 2019, respectively.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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