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Note 2 - Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
US Government [Member]    
Costs incurred on uncompleted contracts $ 349,458,368 $ 299,871,583
Estimated earnings 62,718,792 56,708,610
Sub-total 412,177,160 356,580,193
Less billings to date 353,601,903 313,441,471
Costs and estimated earnings in excess of billings on uncompleted contracts 58,575,257 43,138,722
Commercial [Member]    
Costs incurred on uncompleted contracts 123,078,356 90,272,545
Estimated earnings 49,539,299 39,773,983
Sub-total 172,617,655 130,046,528
Less billings to date 128,745,963 94,324,761
Costs and estimated earnings in excess of billings on uncompleted contracts 43,871,692 35,721,767
Costs incurred on uncompleted contracts 472,536,724 390,144,128
Estimated earnings 112,258,091 96,482,593
Sub-total 584,794,815 486,626,721
Less billings to date 482,347,866 407,766,232
Costs and estimated earnings in excess of billings on uncompleted contracts $ 102,446,949 $ 78,860,489