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v3.21.1

Critical Accounting Policies and Estimates (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Allowance for doubtful accounts | $ 51,000 |  | $ 41,000
Accounts receivable for chargebacks | 402,000 |  | 179,000
Allowance for slow moving and obsolete inventory | 451,000 |  | 546,000
Recorded contract assets | 549,000 |  | 554,000
Amount of revenue from contract liabilities related to open jobs outstanding | 2,710,000 |  |
Impairment of long-lived assets | 0 | $ 0 |
Estimated liability for compensation claims | 763,000 |  | 933,000
Liability for post retirement healthcare benefits | 9,048,000 |  | $ 9,109,000
Contract-based intangible assets |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Impairment on contract assets | $ 0 |  |

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