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Note 4 - Costs, Estimated Earnings, and Billings on Uncompleted Contracts (Details) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Costs incurred on contracts in progress $ 4,888,161 $ 4,250,300
Estimated earnings 5,781,456 4,541,377
10,669,617 8,791,677
Billings to date (7,740,478) (7,621,523)
2,929,139 1,170,154
Included in accompanying balance sheets under the following captions:    
Costs and estimated earnings in excess of billings on contracts in progress 3,329,357 2,498,662
Billings in excess of costs and estimated earnings on contracts in progress $ (400,218) $ (1,328,508)