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Note 4 - Net Unbilled and Estimated Billings (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Costs and estimated earnings in excess of billings on uncompleted contracts $ 92,884,034 $ 102,622,387
Billings in excess of costs and estimated earnings on uncompleted contracts (71,974) (175,438)
Totals $ 92,812,060 $ 102,446,949