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Note 3 - Revenue - Costs, Estimated Earnings, and Billings on Uncompleted Contracts (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Costs incurred on contracts in progress | $ 14,390 | $ 7,419
Estimated earnings | 10,926 | 5,071
Costs and Estimated Earnings on Uncompleted Contracts | 25,316 | 12,490
Billings to date | (26,925) | (11,409)
Net Cost in Excess of Billings | (1,609) | 1,081
Deferred revenue related to non-systems contracts | (263) | (193)
Contract Liability In Excess of Contract Assets | (1,872) | 888
Included in accompanying consolidated balance sheets under the following captions (in thousands): |  |
Contract assets | 2,170 | 2,538
Contract liabilities | $ 4,042 | $ 1,650

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