Note 4 - Contracts in Progress - Costs, Estimated Earnings, and Billings on Uncompleted Contracts (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Costs incurred on contracts in progress	$ 4,847,325	$ 7,695,281
Estimated earnings	14,091,572	7,635,114
Total	18,938,897	15,330,395
Less: Billings to date	(24,909,939)	(10,695,377)
Cost in excess of billing, net	(5,971,042)	4,635,018
Included in accompanying balance sheets under the following captions:
Costs and estimated earnings in excess of billings on contracts in progress	3,159,828	4,635,018
Billings in excess of costs and estimated earnings on contracts in progress	(9,130,870)
Cost in excess of billing, net	$ (5,971,042)	$ 4,635,018