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Note 4 - Revenue Recognition - Reconciliation of the Cost in Excess of Billings (Details) - USD ($) $ in Thousands | Jan. 31, 2021 | Jan. 31, 2020
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Costs incurred on uncompleted contracts | $ 17,543 | $ 15,553
Estimated earnings | 9,651 | 8,641
Earned revenue | 27,194 | 24,194
Less billings to date | 23,949 | 23,201
Costs in excess of billings, net | 3,245 | 993
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts | 4,007 | 2,166
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts | $ (762) | $ (1,173)

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