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v3.22.1

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets |  |
Leases | $ 233 | $ 319
Employee benefits | 1,208 | 1,471
Accrued losses on uncompleted contracts | 2,572 | 3,015
Stock based compensation expense | 247 | 225
Federal net operating losses | 21,724 | 19,345
State net operating losses | 3,299 | 3,620
R&D and other tax credits | 938 | 806
Other | 545 | 398
Total deferred tax assets | 30,766 | 29,199
Deferred tax liabilities |  |
Property, plant and equipment and AHFS | (1,285) | (2,632)
Prepaid insurance | (231) | (511)
Total deferred tax liabilities | (1,516) | (3,143)
Net deferred tax assets | 29,250 | 26,056
Valuation allowance | (29,331) | (26,168)
Net deferred taxes | $ (81) | $ (112)

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