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Note 4 - Contracts in Progress - Costs, Estimated Earnings, and Billings on Uncompleted Contracts (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Costs incurred on contracts in progress $ 11,557,916 $ 4,678,192
Estimated earnings 19,302,951 10,733,826
Total 30,876,962 15,412,018
Less: Billings to date 26,634,938 18,077,839
Less: Billings to date (26,634,938) (18,077,839)
Included in accompanying balance sheets under the following captions: 4,242,024 (2,665,821)
Costs and estimated earnings in excess of billings on contracts in progress 4,457,926 2,596,518
Billings in excess of costs and estimated earnings on contracts in progress (215,902) (5,262,339)
Cost in excess of billing, net $ 4,242,024 $ (2,665,821)