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Note 4 - Revenue Recognition - Reconciliation of the Cost in Excess of Billings (Details) - USD ($) $ in Thousands | Jan. 31, 2022 | Jan. 31, 2021
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Costs incurred on uncompleted contracts | $ 20,021 | $ 17,543
Estimated earnings | 12,030 | 9,651
Earned revenue | 32,051 | 27,194
Less billings to date | 31,019 | 23,949
Costs in excess of billings, net | 1,032 | 3,245
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts | 2,309 | 4,007
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts | $ (1,277) | $ (762)

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