Note 3 - Costs, Estimated Earnings, and Billings on Uncompleted Contracts (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Costs incurred on contracts in progress	$ 7,695,281	$ 4,250,299
Estimated earnings	7,635,114	4,541,377
Total	15,330,395	8,791,677
Billings to date	(10,695,377)	(7,621,523)
Cost in excess of billing, net	4,635,018	1,170,154
Included in accompanying balance sheets
Costs and estimated earnings in excess of billings on contracts in progress	$ 4,635,018	2,498,662
Billings in excess of costs and estimated earnings on contracts in progress		$ (1,328,508)