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Note 3 - Revenue - Costs, Estimated Earnings, and Billings on Uncompleted Contracts (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020
--- | --- | --- | ---
Costs incurred on contracts in progress | $ 7,418,433 | $ 4,464,471 |
Estimated earnings | 5,071,039 | 2,087,396 |
Costs and Estimated Earnings on Uncompleted Contracts | 12,489,472 | 6,551,867 |
Billings to date | (11,408,605) | (6,212,229) |
Net Cost in Excess of Billings | 1,080,867 | 339,638 |
Deferred revenue related to non-systems contracts | (192,920) | (632,014) |
Contract Liability In Excess of Contract Assets | 887,947 | (292,376) |
Included in accompanying balance sheets |  |  |
Contract assets | 2,538,373 | 494,281 | $ 500,000
Contract liabilities | $ (1,650,426) | $ (786,657) |

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