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Note 2 - Net Unbilled and Estimated Billings (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Costs and estimated earnings in excess of billings on uncompleted contracts $ 102,622,387 $ 79,054,139
Billings in excess of costs and estimated earnings on uncompleted contracts (175,438) (193,650)
Totals $ 102,446,949 $ 78,860,489